{"product_id":"lenovo-k10-2019-replacement-battery-38v-2800mah-li-polymer","title":"KC40 Lenovo K10 2019 Replacement Battery 3.8V 2800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo K10 2019 \/ XT2025-3 — 3.8V Li-Polymer Replacement Battery (KC40)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 2800mAh lithium-polymer cell replaces the original KC40 battery in the Lenovo K10 2019, K10 2019 Global, and XT2025-3 smartphones. It restores power to devices where the original cell has degraded past usable capacity. Dimensions are 77.70 × 62.14 × 4.20mm — same footprint as the factory unit.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK10 2019 and XT2025-3 compatibility:\u003c\/strong\u003e\n    All three variants — K10 2019, K10 2019 Global, and XT2025-3 — share the same battery bay dimensions, connector pinout, and BMS handshake protocol. One cell fits all three without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the K10 2019 platform. The BMS accepted the cell on first connection, charge IC engaged correctly, and no thermal or overcurrent trips occurred during the test cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use, disable fast charging and run one full discharge down to auto-shutdown, then charge to 100% without interruption. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the K10 2019 shuts down suddenly at 20–30% after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe K10 2019 fuel gauge IC carries calibration data from the original cell's discharge curve. When a new cell goes in, the IC doesn't immediately know where the voltage cliff is on the replacement chemistry. Under high-draw loads — 4G modem activity, screen at full brightness — the cell voltage can drop faster than the gauge predicts, triggering a protective shutdown before the displayed percentage reaches zero. One full unconstrained discharge-charge cycle gives the coulomb counter enough data to re-anchor its low-voltage threshold to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the KC40 sat discharged in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLithium-polymer cells left below approximately 2.5V trigger a BMS lockout that blocks normal power-on. Plugging in and pressing the power button does nothing because the protection circuit is open. Connect the phone to a charger and leave it untouched for 15–30 minutes — the charge IC trickle-charges the cell at low current until voltage rises above the BMS re-enable threshold, typically around 2.9V, at which point the circuit closes and normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391861981274,"sku":"BWCS-MXE610SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391862014042,"sku":"BWCS-MXE610SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391862046810,"sku":"BWCS-MXE610SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MXE610SL-1.webp?v=1779142368","url":"https:\/\/batteryweb.com\/products\/lenovo-k10-2019-replacement-battery-38v-2800mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}