{"product_id":"lenovo-ideatab-miix-3-replacement-battery-37v-4200mah-li-polymer","title":"Lenovo Ideatab Miix 3 L14C1P21 Compatible Battery 3.7V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo Ideatab Miix 3 — 3.7V Li-Polymer Replacement Battery (L14C1P21)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 4200mAh (15.54Wh) Li-Polymer battery for the Lenovo Ideatab Miix 3 and Miix3-830 tablet. It replaces OEM part L14C1P21, which sits inside the non-removable tablet assembly. The Miix 3 is a detachable hybrid — it runs as both a standalone tablet and a laptop when docked to its keyboard base.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMiix 3 and Miix3-830 compatibility:\u003c\/strong\u003e\n    Both the Miix 3 and Miix3-830 draw from the same 3.7V cell with the L14C1P21 part number. The connector pinout, BMS handshake protocol, and physical dimensions — 133.50 × 72.40 × 3.20 mm — are identical across both variants. No adapter or modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran L14C1P21 replacements through charge and discharge cycles on a Miix 3 unit. The BMS accepted the new cell without throwing a fault code, and the charge IC reached a full-state cutoff correctly at 4.2V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after swap:\u003c\/strong\u003e\n    After installing this battery, run the tablet down to automatic shutoff — do not force-power it off — then charge uninterrupted to 100%. That single full cycle lets the fuel gauge IC map its cutoff thresholds against the new cell and clears the inaccurate percentage readings that appear immediately after a swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eMiix 3 shutting down at 15–25% remaining after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis shutdown happens because the fuel gauge IC is still calibrated to the old cell's voltage curve. The new cell's voltage drops steeply under combined display and Wi-Fi load around that 15–25% window, and the IC interprets it as a critical-low event. It triggers a forced shutdown even though usable charge remains. One complete discharge-to-shutoff followed by an uninterrupted charge to 100% resets the calibration and moves the cutoff threshold to the correct voltage floor.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eFast charging not resuming after a battery swap on the Miix 3\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Miix 3 charge controller uses a negotiation handshake with the charger on the first accepted charge cycle after a new cell is installed. Until that cycle completes, the device defaults to a lower current draw as a protective fallback. This can look like fast charge has stopped working. Plug in the original Lenovo charger, let the tablet complete one full charge from below 10% to 100% without interruption, and the charge IC will re-enable the higher current rate on the next session.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43425859960922,"sku":"BWCS-LVM380SL-1","price":42.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43425859993690,"sku":"BWCS-LVM380SL-2","price":48.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43425860026458,"sku":"BWCS-LVM380SL-3","price":53.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVM380SL-1.webp?v=1779930025","url":"https:\/\/batteryweb.com\/products\/lenovo-ideatab-miix-3-replacement-battery-37v-4200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}