{"product_id":"alpsat-satfinder-spare-part-3hd-replacement-battery-74v-3400mah-li-ion","title":"ALPSAT Satfinder 3HD Replacement Battery 7.4V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eALPSAT Satfinder Spare Part 3HD — 7.4V Li-ion Replacement Battery (4SF3HDS1)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 7.4V Li-ion replacement battery rated at 3400mAh (25.16Wh) for the ALPSAT Satfinder Spare Part 3HD portable satellite finder. The Satfinder 3HD is a handheld field instrument used by technicians to locate and align satellite signals during installation and maintenance work. When the original cell degrades and the unit can no longer hold a charge through a full job, this pack restores field-ready power.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSatfinder 3HD platform fit:\u003c\/strong\u003e\n    The 3HD uses a dedicated battery bay with a three-contact interface. The BMS in this pack matches the charge communication protocol the instrument expects — mismatched cells without the correct handshake trigger immediate charge rejection on the 3HD's charge circuit.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack through signal-scan and transponder-lock sequences on the 3HD. The BMS held stable through the tuner's initialisation current draw and did not trip on repeated cold-start events across multiple cycles.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-use calibration on the 3HD:\u003c\/strong\u003e\n    After fitting this pack, run the instrument through a full signal-scan calibration cycle before taking it to site. The 3HD maps battery state during that cycle, and skipping it causes the low-battery indicator to fire prematurely on your first real measurement session.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBMS lockout after the Satfinder 3HD sits unused in a carry case\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge over time. If the 3HD sits unused for several months, the pack can drop below the BMS's minimum recovery threshold — typically around 2.5V per cell. At that point the BMS enters a protective lockout state and the instrument will not power on or respond to the charger. Connecting the pack to a Li-ion compatible charger with a recovery or trickle mode can bring the cell voltage back above the wake threshold. Once the BMS sees voltage above approximately 3.0V per cell, normal charging resumes.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSatfinder 3HD display showing erratic battery percentage after a pack swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe 3HD's fuel indicator is calibrated to the voltage curve of the original cell. A new pack with a fresh, full charge presents a slightly different resting voltage than a worn original, which causes the indicator to read inconsistently — jumping between levels or reporting low charge on a full cell. This corrects itself after one or two full discharge-and-charge cycles, during which the instrument re-anchors its percentage thresholds to the new cell's actual voltage curve. Run those cycles under normal field conditions — powering up, scanning, and locking onto a signal — rather than leaving the unit idle. After two full cycles the readout stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43360576929882,"sku":"BWCS-ASF310XL-1","price":34.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43360576962650,"sku":"BWCS-ASF310XL-2","price":39.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43360576995418,"sku":"BWCS-ASF310XL-3","price":43.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ASF310XL-1.webp?v=1778615988","url":"https:\/\/batteryweb.com\/products\/alpsat-satfinder-spare-part-3hd-replacement-battery-74v-3400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}