{"product_id":"fitbit-versa-3-replacement-battery-385v-260mah-li-polymer","title":"FitBit Versa 3 Compatible Battery 3.85V 260mAh LSS352325P","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFitBit Versa 3 — 3.85V Li-Polymer Replacement Battery (LSS352325P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 260mAh lithium-polymer cell replaces the original LSS352325P battery in the FitBit Versa 3 smartwatch. It restores power to all core functions — fitness tracking, heart rate monitoring, sleep tracking, and notifications. Dimensions are 27.40 × 22.80 × 3.30mm, matching the original cell footprint inside the Versa 3 chassis.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVersa 3 platform fit:\u003c\/strong\u003e\n    The Versa 3 uses a compact flex connector with a specific pin-out tied to the fuel gauge IC on the mainboard. This cell matches that connector and voltage curve so the BMS can read state-of-charge correctly after the swap.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on the Versa 3 mainboard and confirmed the BMS accepted the new cell without fault flags. The fuel gauge re-initialised cleanly once the watch completed a full charge cycle from near-zero.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charge cycle on the Versa 3:\u003c\/strong\u003e\n    Place the watch on its magnetic charger immediately after fitting this cell and charge it to 100% before first use. The Versa 3 fuel gauge IC loses its reference point when the old cell is removed — it cannot calibrate state-of-charge without one full charge cycle starting from near-zero.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Versa 3 shows 0% immediately after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Versa 3 uses a coulomb-counting fuel gauge IC that tracks charge by measuring current in and out of the cell over time. When you disconnect the old battery, the IC loses its reference entirely — it has no baseline for the new cell. The watch will display 0% or refuse to boot until it sees a full charge cycle. Put the watch straight on the charger after the swap and let it reach 100% before powering it on.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eNew battery draining to empty within a single day on the Versa 3\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe most common cause is continuous heart rate monitoring running alongside an always-on display — both active at once push draw well beyond what this 260mAh cell is rated to sustain over a full day. Check the display settings and confirm always-on mode is off if it was not intentionally enabled after the swap. Continuous GPS sessions compound this further; the Versa 3 GPS radio alone pulls enough current to deplete the cell in a fraction of a normal use day. Disable continuous HR polling and always-on display, then check drain again — resting draw should keep the watch running across multiple days.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416163352666,"sku":"BWCS-FTV300SL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416163385434,"sku":"BWCS-FTV300SL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416163418202,"sku":"BWCS-FTV300SL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-FTV300SL-1.webp?v=1779760505","url":"https:\/\/batteryweb.com\/products\/fitbit-versa-3-replacement-battery-385v-260mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}