{"product_id":"garmin-tactix-7-replacement-battery-37v-300mah-li-polymer","title":"Garmin Tactix 7 Replacement Battery 3.7V 300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eGarmin Tactix 7 \/ fenix 7X — 3.7V Li-Polymer Replacement Battery (361-00147-10)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 300mAh lithium-polymer cell for the Garmin Tactix 7 and fenix 7X smartwatches. It replaces OEM part 361-00147-10 and restores power to the display, GPS module, heart rate sensor, and onboard navigation functions. Physical dimensions are 36.50 × 25.20 × 4.30mm — measure your existing cell before ordering if you are unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTactix 7 and fenix 7X compatibility:\u003c\/strong\u003e\n    Both watches run the same power architecture — identical voltage rail, connector footprint, and BMS handshake protocol — so one cell covers both platforms without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Tactix 7 platform. The BMS accepted the new cell without fault codes, and the fuel gauge IC re-calibrated correctly after a full charge cycle from near-zero.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charge requirement for the Tactix 7 and fenix 7X:\u003c\/strong\u003e\n    After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before first use. The fuel gauge IC on these platforms loses its reference point when the cell is swapped and cannot recalibrate without a complete charge cycle from near-zero — skipping this step causes the watch to report inaccurate state-of-charge from day one.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Tactix 7 reports 0% and won't boot after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Tactix 7 uses a coulomb-counting fuel gauge IC that tracks charge by measuring current flow over time. When the cell is removed, that running count resets to an undefined state. A new cell at partial charge gives the IC no valid baseline, so it defaults to 0% and the watch refuses to boot as a low-battery protection measure. The fix is straightforward: connect the magnetic charger immediately after reassembly and let it reach 100% uninterrupted. Once the IC completes a full charge sweep, it locks in the new reference and percentage readings return to normal.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGPS and always-on display draining the new cell faster than expected\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh lithium-polymer cell presents slightly different internal impedance than a worn cell, and the Tactix 7's power management firmware adjusts current draw accordingly during the first several charge cycles. GPS tracking and always-on display mode together represent the highest sustained current load this 300mAh cell will see — running both simultaneously will noticeably shorten the charge interval compared to watch-only or step-tracking mode. This behaviour typically stabilises after three to five full charge cycles as the cell's impedance settles. If drain remains excessive beyond that point, check that the always-on display setting has not been re-enabled after the swap, as it resets to on during some firmware re-initialisation events.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416153948250,"sku":"BWCS-GMT700SH-1","price":36.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416153981018,"sku":"BWCS-GMT700SH-2","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416154013786,"sku":"BWCS-GMT700SH-3","price":47.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-GMT700SH-1.webp?v=1779760505","url":"https:\/\/batteryweb.com\/products\/garmin-tactix-7-replacement-battery-37v-300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}