{"product_id":"apple-a2686-replacement-battery-385v-560mah-li-polymer","title":"Apple Watch Ultra 2 Compatible Battery 3.85V 560mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple Watch Ultra 2 — 3.85V Li-Polymer Replacement Battery (A2956)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 560mAh Li-Polymer cell replaces the original battery in the Apple Watch Ultra 2 (A2686, A2887, 49mm). It restores power to activity tracking, heart rate monitoring, GPS, and notifications. Fit the cell and charge to full before first use — the fuel gauge IC needs a complete cycle after any cell swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUltra 2 platform fit (A2686 \/ A2887):\u003c\/strong\u003e\n    Both variants share the same 3.85V rail, connector pinout, and BMS handshake spec, so one cell covers the full Ultra 2 lineup without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on an Ultra 2 chassis and confirmed the BMS accepted the new cell without a fault flag, voltage held steady through a full charge cycle, and the fuel gauge reported correctly after calibration.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charging requirement:\u003c\/strong\u003e\n    After fitting, place the watch on its magnetic charger immediately and charge to 100% before wearing it. The fuel gauge IC on the Ultra 2 loses its reference point when the cell is disconnected — skipping this step causes the watch to display wildly inaccurate battery percentages for days.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Watch Ultra 2 drains a new cell faster in the first week\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh cell has higher internal impedance than a broken-in one. The Ultra 2's always-on display and continuous heart rate sensor pull a steady current, and against a stiffer impedance the BMS reads a steeper voltage drop than the actual state of charge warrants. This makes the watch appear to drain faster than it actually is. After 5–7 full charge cycles the impedance settles, and the fuel gauge recalibrates to match real capacity.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWatch not pairing with iPhone after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery kills the BLE session entirely — the watch loses its authenticated link to the paired iPhone. This is not a fault with the new cell. Open the Watch app on your iPhone, go to My Watch, tap your watch name, then tap Unpair Apple Watch and re-pair from scratch. The watch reboots into pairing mode at approximately 3.82–3.85V resting voltage once the new cell is seated and charged.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43306861461594,"sku":"BWCS-IPW249SH-1","price":56.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43306861494362,"sku":"BWCS-IPW249SH-2","price":66.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43306861527130,"sku":"BWCS-IPW249SH-3","price":74.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IPW249SH_1.webp?v=1777768812","url":"https:\/\/batteryweb.com\/products\/apple-a2686-replacement-battery-385v-560mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}