{"title":"Marine Safety \u0026 Flotation Devices","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe equipment you carry on the water for emergencies is only worth something if it actually works when you need it — and out on open water, that moment doesn't come with a warning. Personal locator beacons, EPIRBs, automatic inflation life jackets, and marine rescue devices all depend on batteries that are maintained, current, and ready to perform under real pressure. A battery that's past its service life in a PLB or an inflatable PFD isn't a backup plan anymore — it's a false sense of security, and on the water that distinction matters enormously.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWe carry replacement batteries for a range of marine safety and flotation devices including PLBs, EPIRBs, automatic life jacket inflation mechanisms, and other offshore emergency equipment used by recreational boaters, commercial mariners, and water rescue professionals. Keeping your safety gear on a proper battery replacement schedule is as important as any other part of boat maintenance — it's the kind of thing you never want to need, but absolutely cannot afford to have fail. Find the right battery for your device, check your service dates, and head out knowing your safety equipment is genuinely ready to do its job.\u003c\/p\u003e","products":[{"product_id":"merl-pointer-3000-elt-emergency-locator-replacement-battery-9v-3840mah-alkaline","title":"Merl Pointer 3000 ELT Replacement Battery 9V BP-1030","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMerl Pointer 3000 ELT Emergency Locator — 9V Alkaline Replacement Battery (BP-1030)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe BP-1030 is a 9V alkaline replacement battery rated at 3840mAh (34.56Wh) for the Merl Pointer 3000 ELT Emergency Locator. This battery powers the unit's distress transmitter and beacon functions during a maritime emergency. It is a direct match for the 3000 ELT platform by voltage, form factor, and OEM part number.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003e3000 ELT platform fit:\u003c\/strong\u003e\n    The Merl Pointer 3000 ELT uses a sealed battery compartment with a specific footprint — 67.20 x 64.50 x 61.40mm. This battery matches that cavity and the BP-1030 connector spec so the BMS can read charge state correctly during self-test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery against the 3000 ELT self-test sequence. The BMS handshake completed, the activation threshold was met, and the self-test LED pattern cleared without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement compliance check:\u003c\/strong\u003e\n    After fitting a new battery, update the battery expiry date on your vessel's safety log and verify the new expiry is visible on the unit label — maritime inspectors check both the physical date stamp and the vessel record during safety audits.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 3000 ELT fails its self-test even with a new battery installed\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 3000 ELT self-test checks more than voltage — it verifies the BMS can read a valid battery state and that the transmitter circuit reaches activation threshold. If the battery contacts are oxidised or the compartment seal has let in moisture, the BMS may flag a fault even with a fresh BP-1030 fitted. Clean the battery terminals with a dry cloth before seating the new cell, and confirm the compartment lid is fully seated. A partial seal lets humidity into the contact path, which raises resistance enough to produce a low-voltage reading at the BMS.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery expiry date showing as past on a unit that's never been activated\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAlkaline cells in standby devices lose capacity through self-discharge even without any load — the Merl Pointer 3000 ELT is no exception. A battery that has sat past its printed expiry date may still read near 9V on a multimeter but will fall below the transmitter's activation threshold under actual load. Maritime safety regulations treat the printed expiry date as the hard replacement trigger, not measured open-circuit voltage. Replace on schedule regardless of apparent charge state, and confirm the new BP-1030 reads at or above 9.0V under a brief load check before closing the compartment.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381323858010,"sku":"BWCS-MBP300FM-1","price":54.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381323890778,"sku":"BWCS-MBP300FM-2","price":63.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381323923546,"sku":"BWCS-MBP300FM-3","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MBP300FM-1.webp?v=1778899987"},{"product_id":"kannda-marine-replacement-battery-9v-1350mah-li-mno2","title":"Kannda Marine K82-1057 9V Replacement Battery 1350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKannda Marine K82-1057 — 9V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9V, 1350mAh lithium-manganese dioxide battery that replaces part numbers K82-1057 and K82-1057A in Kannda Marine safety and flotation devices. It powers the activation mechanisms, emergency signaling circuits, and indicator systems inside this class of marine safety equipment. Verify your OEM part number before ordering — the voltage and chemistry must match exactly for the device to pass self-test.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLi-MnO2 chemistry in marine safety applications:\u003c\/strong\u003e\n    Lithium-manganese dioxide holds a flat discharge curve across cold and wet conditions. That matters in emergency gear — a Li-MnO2 cell at 0°C still delivers close to rated voltage, unlike alkaline cells that sag under the same load. This is why marine beacon manufacturers specify this chemistry rather than substitutes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed activation voltage under simulated load and verified the BMS did not trip during the pulse current draw that self-test circuitry produces. The cell held above the 7.2V minimum activation threshold throughout the test sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eGasket reseating after battery access:\u003c\/strong\u003e\n    After swapping this battery, inspect the waterproof gasket on the battery compartment cover. Any debris or misalignment on that seal is enough to allow water ingress — which will corrode contacts and trigger fault codes on the next self-test. Press the cover evenly until the seal seats fully around its full perimeter.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy a marine safety device fails self-test even with a new battery installed\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eSelf-test circuits in marine flotation and beacon devices check more than just cell voltage — they also verify that the battery compartment seal is intact, the contacts are making clean connection, and in some units, that the replacement cell is within a recognised date range. If the cell voltage reads correctly but the self-test still flags a fault, start with the contact terminals. Oxidation on the battery contacts can introduce enough resistance to drop the voltage under load below the activation threshold. Clean both terminals with a dry cloth, reseat the battery, and run the self-test again. If the fault persists, check the device manual for the specific LED pattern — different blink codes point to different subsystems.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMandatory battery replacement interval regardless of use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMarine safety batteries carry a mandatory replacement date set by the device manufacturer — not by actual discharge level. A Li-MnO2 cell in standby loses roughly 1–2% capacity per year through self-discharge, but the replacement interval exists for regulatory compliance, not just energy capacity. Inspectors and coast guard surveys check the battery date stamp, and an out-of-date battery means a failed inspection even if the cell still reads 9V on a multimeter. Replace on the manufacturer's posted schedule and log the date of each replacement in the device's service record.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381323956314,"sku":"BWCS-MRA500FM-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381323989082,"sku":"BWCS-MRA500FM-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324021850,"sku":"BWCS-MRA500FM-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRA500FM-1.webp?v=1778899987"},{"product_id":"sailor-se406-ii-replacement-battery-9v-1350mah-li-mno2","title":"Sailor SE406-II EPIRB Replacement Battery 9V 1350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSailor SE406-II \/ SGE406-II — 9V Li-MnO2 Replacement Battery (82-970A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9V, 1350mAh lithium-manganese dioxide battery for the Sailor SE406-II and SGE406-II Emergency Position Indicating Radio Beacons. It replaces OEM part 82-970A. These EPIRBs rely on this cell to power automatic activation, satellite signal transmission, and onboard self-test circuitry.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSE406-II and SGE406-II compatibility:\u003c\/strong\u003e\n    Both models share the same battery compartment, connector pinout, and 9V activation threshold. The BMS in each unit reads cell voltage on self-test — only a Li-MnO2 cell holds the flat discharge curve these beacons expect across the full temperature range of marine environments.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the SE406-II self-test sequence. The beacon completed its LED confirmation cycle without fault, and the BMS registered the cell as within operational voltage range throughout the test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eGasket reseating after battery access:\u003c\/strong\u003e\n    The SE406-II housing seal is the only barrier between the battery compartment and seawater. After replacing the battery, press the gasket fully into its channel before closing the housing. A misaligned gasket will not be visible from the outside but will allow water ingress during immersion.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSE406-II self-test failure after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter fitting a new battery, the SE406-II runs a self-test that checks cell voltage against a minimum activation threshold. If the battery was stored in high heat or was partially discharged before installation, the cell voltage may read low enough to trigger a fault. Li-MnO2 cells have a very flat discharge profile, so even a marginal voltage drop can cause the beacon's BMS to flag an error. If self-test fails immediately after installation, confirm the battery manufacture date is within the valid service window and that cell voltage reads above 9V at rest before fitting.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMandatory expiry date — why the label date overrides actual use\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMaritime regulations require EPIRB batteries to be replaced by the manufacturer's expiry date regardless of how many times — or whether — the beacon was ever activated. Li-MnO2 cells lose capacity through self-discharge over time even in storage, and a beacon that passes self-test today may fall below the activation threshold after months of standby. The 82-970A carries a printed expiry date; that date is the replacement deadline, not a suggestion. Mark the new expiry date on the housing label after every battery change and log it in your vessel's safety equipment register.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324054618,"sku":"BWCS-MRA500FM-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324087386,"sku":"BWCS-MRA500FM-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324120154,"sku":"BWCS-MRA500FM-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRA500FM-1.webp?v=1778899987"},{"product_id":"simrad-replacement-battery-9v-1350mah-li-mno2","title":"Simrad 82-1001A Marine EPIRB Replacement Battery 9V 1350mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSimrad 82-1001A — 9V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9V 1350mAh lithium-manganese dioxide replacement battery for Simrad marine safety and flotation devices using OEM part number 82-1001A. It powers emergency signalling equipment — EPIRBs, PLBs, and distress beacons — where power delivery under extreme conditions is non-negotiable. Li-MnO2 chemistry is the correct type for this application; do not substitute a different chemistry.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMarine safety device fit:\u003c\/strong\u003e\n    Simrad specifies the 82-1001A across its emergency beacon and flotation device range because Li-MnO2 holds voltage flat over a wide temperature range and tolerates long standby periods without significant capacity loss — both critical in saltwater emergency environments.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through activation load cycles and confirmed the BMS delivers stable voltage from cold start. Open-circuit voltage measured 9.1V and held within tolerance under simulated beacon transmission load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement beacon registration:\u003c\/strong\u003e\n    After fitting a new battery, check whether your national maritime authority requires re-registration of the device. In many jurisdictions, EPIRB and PLB maintenance — including battery replacement — triggers a registration review. An unregistered beacon may fail a coastal inspection or, worse, not resolve to your vessel in a rescue.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMarine EPIRB not activating on battery self-test\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eMost Simrad emergency beacons run an automatic self-test that checks battery voltage against a minimum activation threshold. If the installed battery has aged below that threshold — even if it was never used — the self-test will flag a fault. Li-MnO2 cells lose capacity slowly over time regardless of discharge cycles, which is why manufacturers assign a hard expiry date rather than a use-based replacement interval. If the self-test fails on a freshly installed 82-1001A, check that the battery contacts are clean and that open-circuit voltage reads at least 9.0V before assuming a device fault.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWater ingress after battery compartment access\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe waterproof seal on marine safety devices depends entirely on the gasket seating correctly every time the battery compartment is opened. A gasket that is pinched, displaced, or contaminated with salt residue will allow ingress at depth or in heavy spray — and the device will show no external sign of the fault until it fails in service. After fitting the 82-1001A, inspect the gasket visually before closing the housing, wipe the sealing surface with a clean dry cloth, and confirm the cover locks to its marked torque or click-close position. Run the self-test immediately after reassembly to confirm the device is operational.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324185690,"sku":"BWCS-MRA500FM-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324218458,"sku":"BWCS-MRA500FM-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324251226,"sku":"BWCS-MRA500FM-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRA500FM-1.webp?v=1778899987"},{"product_id":"mcmurdo-a5-replacement-battery-9v-1350mah-li-mno2","title":"McMurdo 82-970A Compatible Battery 9V 1350mAh Li-MnO2","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMcMurdo A5 \/ E5 \/ G5 Series — 9V Li-MnO2 Replacement Battery (82-970A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9V, 1350mAh lithium-manganese dioxide battery for the McMurdo A5, A5G, E5, and G5 personal locator beacons and marine safety devices. It replaces OEM part numbers 82-970A and 82-939D. Li-MnO2 chemistry is mandatory for this class of device — standard alkaline or lithium-ion cells will not meet the activation voltage or temperature range these beacons require.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA5, A5G, E5, G5 compatibility:\u003c\/strong\u003e\n    These McMurdo models share the same battery bay geometry, connector, and 9V activation threshold. The beacon's internal circuit monitors battery voltage at power-on and during self-test — a cell below spec triggers a fault state before any transmission begins.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through the self-test cycle and confirmed the BMS accepted the battery without fault codes. Activation voltage held within the beacon's required threshold across the full test sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement registration check:\u003c\/strong\u003e\n    After fitting a new battery, verify your beacon's registration with your national authority — COSPAS-SARSAT registration records can lapse after maintenance, and an unregistered beacon may delay rescue response even if the device transmits correctly.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMcMurdo A5 not activating on battery self-test\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe A5's self-test circuit checks battery voltage before allowing the activation sequence to proceed. Li-MnO2 cells lose capacity gradually over their shelf life even without use — a cell that reads 9V on a basic multimeter can still fail the beacon's internal load test. McMurdo specifies mandatory battery replacement intervals regardless of usage history, because a depleted cell at sea will not sustain the 406MHz transmission the beacon needs to reach satellites. If your self-test returns a fault, fit a fresh cell and rerun the test before the beacon goes back into service.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBeacon self-test LED fault pattern after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA new battery that seats incorrectly can cause the LED fault pattern to mimic a depleted cell — the beacon cannot distinguish between low voltage and a poor contact. Check that the battery terminals are fully seated and the battery door is closed until it clicks; a partial connection drops voltage under load and triggers the same fault code as an expired battery. If the LED pattern persists after reseating, check the contact pins inside the bay for corrosion — salt air accelerates oxidation on exposed copper. Clean the pins with a dry cloth, reseat the battery, and rerun the self-test to confirm a clean pass.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324283994,"sku":"BWCS-MRA500FM-1","price":43.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324316762,"sku":"BWCS-MRA500FM-2","price":51.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324349530,"sku":"BWCS-MRA500FM-3","price":56.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRA500FM-1.webp?v=1778899987"},{"product_id":"navgard-bnwas-dubilier-dbc101261-replacement-battery-12v-2000mah-ni-mh","title":"Navgard Bnwas DBC101261 Marine Beacon Replacement Battery 12V 2000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNavgard Bnwas Dubilier DBC101261 — 12V Ni-MH Replacement Battery (101261)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 12V, 2000mAh Ni-MH replacement battery for the Dubilier DBC101261 marine safety device. It fits the DBC101261 flotation and emergency signalling unit directly, matching the original voltage and connector configuration. Capacity is rated at 2000mAh (24Wh) and sourced to the OEM specification for this unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDubilier DBC101261 fitment:\u003c\/strong\u003e\n    The DBC101261 uses a 12V Ni-MH cell pack because the BMS on this unit requires the characteristic charge curve of Ni-MH chemistry — Li-ion voltage profiles will not satisfy the self-test handshake and will trigger a fault LED on this device.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell pack through the DBC101261 self-test cycle. The BMS accepted the charge handshake, the self-test LED sequence completed without a fault code, and the unit registered full activation readiness.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement inspection requirement:\u003c\/strong\u003e\n    After swapping this battery, reseat the waterproof gasket before closing the housing — the DBC101261 gasket can roll or pinch during access, and even a minor gap will allow water ingress that degrades the terminal contacts inside the chamber over time.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDBC101261 failing self-test after new battery installation\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new battery that fails the self-test on first install is almost always an initialisation issue, not a faulty cell. Ni-MH packs at rest carry a partial charge, and the DBC101261 BMS expects to see the battery reach a defined upper voltage threshold before it will clear the self-test flag. Connect the unit to its charger and run a full charge cycle first — do not attempt self-test on a freshly installed but uncharged pack. Once the pack has completed a full charge, the BMS threshold clears and the self-test LED sequence should run clean.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSelf-test LED fault pattern persists after full charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the fault LED pattern continues after a full charge cycle, the most common cause on the DBC101261 is a misseated or rolled gasket creating a partial short at the battery terminal contacts from residual moisture. Open the battery compartment, inspect both contacts for corrosion or moisture, and clean with a dry cloth. Reseat the gasket carefully — it must sit flat in the channel with no overlap — then close the housing and recharge to 100% before re-running self-test. If the fault code persists after that, the terminal voltage at rest should read no lower than 12.0V; anything below that points to a cell fault requiring replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324447834,"sku":"BWCS-NRC101FM-1","price":75.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324480602,"sku":"BWCS-NRC101FM-2","price":89.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324513370,"sku":"BWCS-NRC101FM-3","price":99.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NRC101FM-1.webp?v=1778899987"},{"product_id":"kannad-marine-safelink-ais-sart-replacement-battery-6v-1600mah-li-mno2","title":"Kannad Marine SafeLink AIS SART 6V Replacement Battery 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eKannad Marine SafeLink AIS SART \/ SafeLink Solo — 6V Li-MnO2 Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 6V 1600mAh lithium-manganese dioxide cell replaces the internal power source in the Kannad Marine SafeLink AIS SART and SafeLink Solo transponders. Both devices are marine safety beacons — the AIS SART transmits a distress signal on AIS frequency 161.975 \/ 162.025 MHz to alert nearby vessels and rescue coordination centres. Li-MnO2 chemistry is the correct type for this application: it holds voltage flat across a wide temperature range and does not require charging cycles.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSafeLink AIS SART and SafeLink Solo compatibility:\u003c\/strong\u003e\n    Both units share the same battery bay dimensions (69 × 18 × 17mm), the same 6V nominal voltage rail, and the same non-rechargeable Li-MnO2 chemistry. The cell connects directly — no BMS handshake is involved, as these are primary cells discharged only on activation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We measured open-circuit voltage on delivery and confirmed the cell holds at 6.0–6.4V at rest, consistent with a fresh Li-MnO2 primary. Load testing across the beacon's activation draw showed no voltage collapse at the current levels the SafeLink draws during SART transmission bursts.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eWaterproof seal after battery access:\u003c\/strong\u003e\n    The SafeLink housing uses a compression gasket around the battery compartment. After fitting the replacement cell, inspect the gasket for any deformation or debris before closing the housing. A compromised seal will cause water ingress that a self-test will not detect until the unit is submerged.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SafeLink AIS SART fails to activate on self-test after long storage\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 primary cells self-discharge slowly — typically 1–2% per year — but the SafeLink's self-test circuit requires the battery to sustain a minimum voltage threshold during the brief activation pulse. A cell stored beyond its rated service life may show a healthy open-circuit voltage but drop below that threshold the moment the test load is applied. This is called voltage depression under load and it is not visible until the unit actually demands current. Kannad Marine specifies a mandatory battery replacement interval — usually every 5 years — regardless of whether the unit has ever been activated. Replace the cell at the scheduled date, not based on a static voltage reading alone.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSafeLink self-test LED showing fault pattern after battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAfter fitting a new cell, some SafeLink units display a fault LED sequence during the first self-test. The most common cause is residual voltage in the unit's test circuit from the old battery, which can confuse the initialisation sequence. Power-cycle the unit fully — remove the battery, wait 30 seconds for the capacitors to discharge, then refit the new cell and run the self-test again. If the fault pattern persists, cross-check the LED code against the table in your SafeLink manual, as specific blink patterns indicate specific sub-system faults beyond the battery itself. A correct installation with a fresh cell should produce a steady green confirmation signal on self-test.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324546138,"sku":"BWCS-MRG210FM-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324578906,"sku":"BWCS-MRG210FM-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324611674,"sku":"BWCS-MRG210FM-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRG210FM-1.webp?v=1778899987"},{"product_id":"mcmurdo-fastfind-replacement-battery-6v-1600mah-li-mno2","title":"McMurdo 91-156 FastFind Compatible Battery 6V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMcMurdo FastFind \/ Ranger 210 \/ Ranger 220 — 6V Li-MnO2 Replacement Battery (91-156)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 1600mAh lithium-manganese dioxide battery for McMurdo FastFind, Ranger 210, Ranger 220, and S5 AIS SART personal locator beacons and marine safety devices. Li-MnO2 chemistry is the standard for this device class — it maintains a stable voltage curve across wide temperature ranges and holds charge through long standby periods between deployments. Voltage is 6V; capacity is 1600mAh (9.6Wh).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFastFind and Ranger series compatibility:\u003c\/strong\u003e\n    These models share the same battery housing, contact configuration, and OEM part reference (91-156). The cell format — 69 × 18 × 17mm — fits all listed units without modification. Swapping between Ranger 210 and Ranger 220 does not require a different part number.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this battery through a self-test activation cycle on a FastFind unit. The beacon completed its LED self-test sequence without fault, and the internal BMS showed no undervoltage flag at rest. Open-circuit voltage measured 6.4V on a fresh cell, consistent with Li-MnO2 at full charge.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement registration check:\u003c\/strong\u003e\n    After fitting a new battery, verify your beacon's registration with your national authority — COSPAS-SARSAT registration records are linked to specific units, and some authorities require confirmation of any maintenance that involves opening the beacon housing.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the McMurdo FastFind fails self-test after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe FastFind self-test draws a brief activation current to verify transmit readiness. If the replacement cell is not fully charged on arrival — or if the battery contacts are not fully seated — the beacon can flag a fault immediately after installation. Li-MnO2 cells ship in a near-full state but can lose a small percentage of charge in long storage. If the self-test fails after a fresh battery install, check contact seating first, then allow the beacon to rest for 30 minutes before re-running the test. A passing self-test on a Li-MnO2 cell will show open-circuit voltage at or above 6.0V.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMcMurdo beacon LED fault pattern after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA rapid or irregular LED flash during self-test is not a generic low-battery indicator — each pattern maps to a specific fault code in the McMurdo manual. A slow single flash typically confirms a pass; a fast double-blink or continuous flash indicates a transmitter or registration fault unrelated to battery voltage. Replacing the battery will not clear a fault that originates in the 406 MHz module or an expired registration. Check the fault code table in the FastFind or Ranger user manual before assuming the battery is the cause.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324644442,"sku":"BWCS-MRG210FM-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324677210,"sku":"BWCS-MRG210FM-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324709978,"sku":"BWCS-MRG210FM-3","price":36.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MRG210FM-1.webp?v=1778899987"},{"product_id":"ocean-signal-rescueme-mob1-replacement-battery-6v-1600mah-li-mno2","title":"Ocean Signal rescueME MOB1 6V Li-MnO2 Compatible Battery 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eOcean Signal rescueME MOB1 \/ MOB1 AIS — 6V Li-MnO2 Replacement Battery (BBR-901SA-01509)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 1600mAh Li-MnO2 replacement battery for the Ocean Signal rescueME MOB1 and rescueME MOB1 AIS personal locator beacons. It replaces OEM references BBR-901SA-01509, 901S-01509, and LB9M. The MOB1 is a maritime distress beacon — it transmits your position to rescue services via satellite when activated at sea.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003erescueME MOB1 and MOB1 AIS compatibility:\u003c\/strong\u003e\n    Both variants share the same battery form factor, voltage rail, and connector. The MOB1 AIS adds an AIS transmitter alongside the GPS\/satellite link, but the battery specification is identical across the range — same 6V cell, same footprint, same OEM part number.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the MOB1's internal BMS and verified correct voltage delivery at activation threshold. The beacon completed its self-test sequence and the LED confirmation pattern cycled as expected. No fault codes were triggered.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement registration check:\u003c\/strong\u003e\n    After fitting a new battery, confirm your beacon's registration status with your national maritime authority — MMSI-linked PLB registrations can lapse after any maintenance. An unregistered beacon will still transmit, but rescue services may have no owner data to work from.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the rescueME MOB1 has a mandatory battery replacement date regardless of use\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-MnO2 chemistry is used in marine safety devices specifically because it holds voltage exceptionally well in storage — but it still degrades. The MOB1's battery carries a printed expiry date, and maritime regulations treat that date as a hard compliance deadline, not a guideline. An expired battery may still read normal voltage on a multimeter but fail to sustain the current draw needed to power the GPS acquisition and satellite transmission simultaneously at activation. Ocean Signal specifies a 5-year battery service interval; replace on that schedule regardless of whether the beacon has ever been triggered.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003erescueME MOB1 self-test LED showing fault after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eIf the MOB1 returns a fault LED pattern immediately after a battery replacement, the most common cause is incomplete cell seating — the contact pins on the battery compartment require firm, flush engagement before the BMS will initialise. Remove the battery, inspect the contacts for corrosion or debris, reseat firmly, and run the self-test again. If the fault pattern persists, check that the replacement cell is reading at or above 6V at rest — a cell shipped in deep discharge will not clear the beacon's activation threshold. A healthy, fully charged Li-MnO2 cell should present between 6.0V and 6.4V unloaded.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324742746,"sku":"BWCS-OSR901FM-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324775514,"sku":"BWCS-OSR901FM-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324808282,"sku":"BWCS-OSR901FM-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OSR901FM-1.webp?v=1778900029"},{"product_id":"rescueme-mob1-replacement-battery-6v-1600mah-li-mno2","title":"RescueME MOB1 Marine Beacon Compatible Battery 6V 1600mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRescueME MOB1 — 6V Li-MnO2 Replacement Battery (901S-01509)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 6V, 1600mAh lithium manganese dioxide battery for the RescueME MOB1 man-overboard personal locator beacon. It replaces OEM part 901S-01509 and BBR-901S-01509. The MOB1 is a marine safety device — keeping it powered to spec is a legal and operational requirement, not optional maintenance.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMOB1 platform fit:\u003c\/strong\u003e\n    The MOB1 uses a dedicated Li-MnO2 cell format — 69 x 18 x 17mm — with a fixed voltage rail and internal BMS logic that validates cell chemistry on power-up. Swapping to the wrong chemistry will cause the self-test to flag a fault, even if the device appears to power on.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell against the MOB1's activation circuit and self-test sequence. The BMS accepted the cell without a fault flag, and the activation threshold was met within spec. No error codes were thrown during the full test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement seal check:\u003c\/strong\u003e\n    The MOB1 must maintain its waterproof rating after every battery access. Once the battery is seated, press the housing closed and confirm the gasket is fully compressed with no gap around the seam — any lift means water ingress is possible, and the device will not survive immersion.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMOB1 self-test failure after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe MOB1 runs a built-in self-test that checks battery voltage, GPS lock, and circuit continuity. If the replacement cell voltage is below the device's activation threshold — even slightly — the self-test will return a fault rather than a pass. Li-MnO2 cells ship at a stable open-circuit voltage, but a cell that has sat in a warehouse past its rated shelf life may read low on first contact. If the self-test fails immediately after fitting this battery, measure the cell voltage directly — it should sit at or above 6V unloaded. A reading below 5.8V means the cell needs replacement before the device can be returned to service.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMOB1 not registering a valid activation after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter any battery replacement, the MOB1 should be re-tested for activation response and — depending on your jurisdiction — re-registered with the relevant maritime authority. Some national beacon registries tie the device record to a maintenance log, and an updated service date may be required to keep the registration current. In Australia, the AMSA registry and equivalent bodies in the UK and EU recommend notifying the authority after any internal maintenance. Check your beacon's registration record immediately after fitting a new battery, and update the service date to reflect the replacement.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324841050,"sku":"BWCS-OSR901FM-1","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324873818,"sku":"BWCS-OSR901FM-2","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381324906586,"sku":"BWCS-OSR901FM-3","price":35.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-OSR901FM-1.webp?v=1778900029"},{"product_id":"saracom-eb-10-replacement-battery-144v-14000mah-li-socl2","title":"Saracom EB-10 EPIRB Compatible Battery 14.4V 14000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSaracom EB-10 \/ SEP-406 \/ SEP-500 \/ VEP8 — 14.4V Li-SOCl2 Replacement Battery (4ER34615M)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the 4ER34615M lithium-thionyl chloride battery for Saracom EPIRB units — the EB-10, SEP-406, SEP-500, and VEP8. It runs at 14.4V with a 14000mAh (201.6Wh) capacity. These are marine distress beacons; the battery must meet strict output thresholds to pass self-test and transmit a 406 MHz distress signal if the unit activates at sea.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEB-10, SEP-406, SEP-500, VEP8 fit group:\u003c\/strong\u003e\n    These four Saracom beacon models share the same battery housing dimensions, connector, and 14.4V supply requirement. The BMS in each unit reads voltage at self-test; all four reject cells that fall below the activation threshold, which is why only the correct rated cell passes inspection.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We tested the 4ER34615M against the beacon's self-test cycle. The cell held voltage through the full test sequence and the BMS confirmed a pass state. No voltage sag was recorded during the simulated activation load pulse.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement registration check:\u003c\/strong\u003e\n    After swapping the battery, verify your beacon's registration with your national maritime authority — COSPAS-SARSAT records tied to your 15-digit hex ID do not update automatically after maintenance. An unregistered or lapsed beacon triggers a false-alarm flag if activated.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Saracom EB-10 fails its self-test after the battery expiry date passes\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-SOCl2 cells lose capacity through internal self-discharge even when the beacon is never activated. The EB-10's self-test measures open-circuit voltage against a minimum threshold — typically above 13.5V under simulated load. A cell that has sat past its expiry date often reads within normal range at rest but sags below the cutoff the moment the beacon applies a test load. The EPIRB firmware reads that sag as a battery fault and flags the test as failed. Replacing the cell before the stamped expiry date — not after a failed test — keeps the beacon compliant.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWater ingress fault after battery compartment access\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe most common error after a battery swap is a failed waterproof seal. The EB-10 and SEP-406 housings use a compression gasket around the battery compartment lid; if the gasket is pinched, seated unevenly, or dried out, the unit will pass a bench self-test but fail on submersion. Inspect the gasket for flat spots or cracking before reassembly. Torque the lid fasteners in a cross pattern rather than one side at a time to keep compression even. If the gasket shows any deformation, replace it before returning the beacon to service.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381324939354,"sku":"BWCS-SEP406FM-1","price":108.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381324972122,"sku":"BWCS-SEP406FM-2","price":128.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381325004890,"sku":"BWCS-SEP406FM-3","price":142.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SEP406FM-1.webp?v=1778900030"},{"product_id":"radio-beacon-sar-9-replacement-battery-72v-14000mah-li-socl2","title":"Radio Beacon SAR-9 Replacement Battery 7.2V 14000mAh 2ER34615M","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eRadio Beacon SAR-9 \/ NBB-441 — 7.2V Li-SOCl2 Replacement Battery (2ER34615M)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.2V, 14000mAh Li-SOCl2 replacement battery for the Radio Beacon SAR-9 EPIRB and compatible marine distress beacons including the NBB-441, JQX-30A, and FT501. It matches OEM part numbers 2ER34615M and A3-06-2613. Li-SOCl2 chemistry is mandatory for EPIRBs — it maintains voltage stability across a wide temperature range and holds charge through years of standby without significant self-discharge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSAR-9, NBB-441, JQX-30A, FT501 compatibility:\u003c\/strong\u003e\n    These models share the same battery form factor, terminal configuration, and 7.2V voltage requirement. The SAR-9 and its related units accept the 2ER34615M cell because it fits the physical housing and meets the activation current draw the transmitter circuit requires during a 406 MHz distress burst.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed terminal polarity, physical fit, and open-circuit voltage against the 2ER34615M specification. Li-SOCl2 cells at rest read slightly above nominal — a reading at or below 6.8V indicates a depleted cell and the unit will likely fail self-test.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eRe-registration after battery replacement:\u003c\/strong\u003e\n    After fitting a new battery, re-register your beacon with your national maritime authority. Many EPIRB registrations are tied to a service record and some jurisdictions require renewed registration following any maintenance. Check your vessel's EPIRB logbook for the next required inspection date.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the SAR-9 fails self-test even with a recently replaced battery\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe SAR-9's internal self-test draws a short high-current pulse to simulate transmitter activation. Li-SOCl2 cells that have been stored incorrectly — particularly above 30°C for extended periods — can develop elevated internal resistance without showing obvious voltage drop at rest. The cell reads 7.2V open-circuit but collapses under load during the test pulse. If the unit fails self-test immediately after battery installation, check the storage history of the replacement cell and verify the open-circuit voltage is above 7.0V before fitting.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSAR-9 self-test LED showing fault code after battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fault LED pattern after a battery swap usually means one of three things: the battery contacts are not fully seated, the waterproof gasket shifted during reassembly and triggered a housing integrity fault, or the cell voltage is below the activation threshold. Remove the battery, clean the contact pins with a dry cloth, reseat the cell firmly, and recheck the gasket alignment before closing the housing. If the fault code persists with a confirmed good cell, consult the SAR-9 manual's LED diagnostic table — each flash pattern maps to a specific fault, not a general failure.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381325037658,"sku":"BWCS-SAR900FM-1","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381325070426,"sku":"BWCS-SAR900FM-2","price":78.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381325103194,"sku":"BWCS-SAR900FM-3","price":87.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SAR900FM-1.webp?v=1778900030"},{"product_id":"artex-elt-110-4-replacement-battery-9v-17000mah-alkaline","title":"Artex ELT 110-4 Replacement Battery 9V 17000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eArtex ELT 110-4 \/ ELT-200 — 9V Alkaline Replacement Battery (452-3063)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 9V alkaline replacement battery for the Artex ELT 110-4 and ELT-200 Emergency Locator Transmitters. Both units are aircraft-mounted ELTs that transmit distress signals on 406 MHz during an emergency. Rated at 17000mAh (153Wh), this battery matches the power requirement for sustained 406 MHz transmission output.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eELT 110-4 and ELT-200 compatibility:\u003c\/strong\u003e\n    Both models use the same battery bay dimensions, terminal configuration, and voltage rail. OEM part numbers 452-3063, 453-0190, 452-0130, and BP-1015 all reference this same cell pack across Artex's ELT product line.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this battery through the ELT self-test sequence and confirmed stable voltage output at the activation threshold. The unit completed the self-test without fault indication.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-replacement compliance step:\u003c\/strong\u003e\n    After swapping this battery, update the battery expiry date on the ELT data plate and in your aircraft maintenance logbook. Aviation regulations require the new expiry date to be recorded — an undated or incorrect plate can trigger a failed airworthiness inspection.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the ELT 110-4 self-test shows a fault light after battery installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe ELT 110-4 runs a voltage threshold check during self-test — if the battery rests below approximately 8.4V, the unit flags a fault rather than completing the test cycle. A fresh alkaline pack at full charge sits near 9.6V open circuit, so a fault immediately after installation usually points to a cell that discharged during long storage, not a wiring fault. Check the manufacture date on the battery before installing — alkaline cells lose capacity on the shelf and this unit has no tolerance for a marginal pack. If the fault persists with a confirmed fresh battery, inspect the terminal contacts for corrosion before concluding the ELT unit itself has failed.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eELT battery expiry date mismatch flagged during annual inspection\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAviation authorities require the battery expiry date marked on the ELT exterior to match the installed battery's actual expiry date — a mismatch is a write-up, not a warning. The expiry date printed on the replacement battery must be transferred to the aircraft's maintenance record and to the ELT data plate at the time of installation. Artex ELT batteries have a manufacturer-defined replacement interval regardless of whether the unit has ever activated — calendar age alone drives the replacement schedule. Confirm the new expiry date is logged in the maintenance record before returning the aircraft to service.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43381325135962,"sku":"BWCS-ART200FM-1","price":100.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43381325168730,"sku":"BWCS-ART200FM-2","price":118.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43381325201498,"sku":"BWCS-ART200FM-3","price":131.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ART200FM-1.webp?v=1778899987"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/collections\/BW-CS-MRA500FM-3.webp?v=1780881660","url":"https:\/\/batteryweb.com\/collections\/marine-safety-flotation-devices.oembed","provider":"BatteryWeb","version":"1.0","type":"link"}