{"product_id":"honor-k2-kids-replacement-battery-385v-660mah-li-polymer","title":"Honor K2 Kids Smartwatch Replacement Battery 3.85V 660mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHonor K2 Kids — 3.85V Li-Polymer Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.85V, 660mAh Li-Polymer cell replaces the original battery in the Honor Fit K2 Kids children's smartwatch. It restores power to the watch's activity tracking, heart rate monitoring, and notification functions. Dimensions are 32.80 × 25.70 × 6.30mm — confirm these against your existing cell before fitting.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHonor K2 Kids platform fit:\u003c\/strong\u003e\n    The K2 Kids uses a compact Li-Polymer cell at 3.85V with a low-current BMS suited to continuous sensor polling. This cell matches that voltage rail and physical footprint, keeping the BMS handshake intact after swap.\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 smartwatch test rig. The BMS accepted the cell without fault flags, and the fuel gauge IC re-initialised correctly after a full charge from near-zero.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge calibration after swap:\u003c\/strong\u003e\n    After fitting this cell, place the watch on its charger immediately and charge to 100% before first use. The fuel gauge IC on this platform loses its reference point when the cell is removed and cannot report accurate charge levels until it completes one full cycle 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 K2 Kids heart rate sensor draws harder on a new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eA fresh Li-Polymer cell has a slightly different internal impedance than a worn one. The optical HR sensor on the K2 Kids adjusts its LED drive current based on the signal it gets back through skin contact. On a new cell, the sensor may run at higher drive current for the first several charge cycles while it settles against the new impedance profile. This is normal and typically resolves within the first week of use as the cell beds in.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWatch not pairing with the phone app after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eRemoving the battery cuts power to the BLE radio and wipes the active session entirely. The phone app retains the old device record, but the watch starts with no pairing state. Go into your phone's Bluetooth settings, forget the K2 Kids device, then open the companion app and run a fresh pairing from the device list. The watch must be powered on and showing the home screen — not the low-battery screen — before the pairing handshake will complete.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43416157782106,"sku":"BWCS-HUP320SH-1","price":38.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43416157814874,"sku":"BWCS-HUP320SH-2","price":45.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43416157847642,"sku":"BWCS-HUP320SH-3","price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HUP320SH-1.webp?v=1779760505","url":"https:\/\/batteryweb.com\/products\/honor-k2-kids-replacement-battery-385v-660mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}