{"product_id":"apple-watch-series-s6-44mm-replacement-battery-385v-300mah-li-polymer","title":"Apple Watch Series 6 44mm Compatible Battery A2327 3.85V 300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple Watch Series S6 44mm — 3.85V Li-Polymer Replacement Battery (A2327)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 300mAh Li-Polymer cell is a direct swap for the Apple Watch Series 6 44mm. It replaces part number A2327 — the original cell Apple fits at the factory. Voltage, dimensions (27.70 × 20.10 × 4.40mm), and connector all match the OEM specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSeries 6 44mm platform fit:\u003c\/strong\u003e\n    The S6 44mm and 40mm share the same chassis generation but carry different cell footprints and capacities. This cell is sized and rated for the 44mm case only — the 40mm uses a different part.\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 a Series 6 44mm unit. The BMS accepted the cell, reported state-of-charge correctly after a full charge cycle, and held voltage under continuous heart rate and GPS polling without dropping below the BMS cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-swap charging requirement:\u003c\/strong\u003e\n    After fitting this cell, place the watch on its magnetic charger immediately and charge to 100% before use. The fuel gauge IC loses its reference point when the original cell is removed. Without a full charge cycle from near-zero, watchOS will report inaccurate battery percentages — sometimes 0% on a charged cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Series 6 fuel gauge IC loses calibration after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Apple Watch Series 6 uses a coulomb-counting fuel gauge IC to track battery state. This IC holds a learned capacity model built from the original cell's charge and discharge history. When the cell is physically removed, that reference is lost — the IC starts with no baseline. A single full charge cycle from near-zero allows the IC to re-anchor its model to the new cell's actual capacity, after which percentage readings stabilise.\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 power during a swap terminates the active Bluetooth Low Energy session between the watch and the paired iPhone. The watch does not automatically re-establish this session on reboot — it presents as an unpaired device. To fix this, open the Watch app on the iPhone, go to My Watch → All Watches, tap the watch name, select Unpair Apple Watch, then re-pair from scratch. This resets the BLE handshake and restores full connectivity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416159977562,"sku":"BWCS-IPW644SH-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416160010330,"sku":"BWCS-IPW644SH-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416160043098,"sku":"BWCS-IPW644SH-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IPW644SH-1.webp?v=1779760522","url":"https:\/\/batteryweb.com\/products\/apple-watch-series-s6-44mm-replacement-battery-385v-300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}