{"product_id":"motorola-moto-360-replacement-battery-37v-240mah-li-polymer","title":"Motorola Moto 360 WX30 Replacement Battery 3.7V 240mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMotorola Moto 360 — 3.7V Li-Polymer Replacement Battery (WX30 \/ SNN5950A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 240mAh lithium-polymer cell replaces the OEM battery in the Motorola Moto 360 smartwatch. It fits the first-generation Moto 360 circular smartwatch running Wear OS. Dimensions are 29.88 x 28.78 x 4.23mm — check these against your cell before installing.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMoto 360 compatibility:\u003c\/strong\u003e\n    The WX30, SNN5950A, and SNN5951A part numbers all reference the same cell format used across Moto 360 production runs. The connector pinout and BMS handshake are identical across these variants, so any of these OEM numbers confirms fitment.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a Moto 360 unit and confirmed the BMS accepted the new cell without fault codes. The fuel gauge IC registered charge state correctly after a full charge cycle from near-zero.\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 bring it to 100% before using it. The fuel gauge IC on the Moto 360 loses its voltage reference when the cell is removed. Without a full charge cycle from near-zero, the percentage readout will be inaccurate or stuck.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Moto 360 fuel gauge reads wrong after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Moto 360 uses a coulomb-counting fuel gauge IC that tracks charge in and out relative to a learned reference point. When you remove the battery, that reference is wiped. The IC then estimates state-of-charge from open-circuit voltage alone, which is imprecise on lithium-polymer cells — especially a new one with a slightly different internal impedance profile. The only way to re-establish an accurate reference is a full charge from near-zero, which resets the upper boundary the IC uses for all future percentage calculations.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWatch not pairing to phone after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery cuts power to the BLE radio mid-session, which drops the active pairing bond stored in volatile memory. The phone still shows the watch as paired, but the watch no longer holds a matching bond key. Open the Wear OS app on your phone, tap the watch name, select \"Forget device,\" then re-pair from scratch. This takes about two minutes and fully restores notification sync and health data logging.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416174526554,"sku":"BWCS-MOT360SH-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416174559322,"sku":"BWCS-MOT360SH-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416174592090,"sku":"BWCS-MOT360SH-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MOT360SH-1.webp?v=1779760648","url":"https:\/\/batteryweb.com\/products\/motorola-moto-360-replacement-battery-37v-240mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}