{"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","url":"https:\/\/batteryweb.com\/products\/sailor-se406-ii-replacement-battery-9v-1350mah-li-mno2","provider":"BatteryWeb","version":"1.0","type":"link"}