{"product_id":"lenovo-k5-replacement-battery-385v-2900mah-li-polymer","title":"Lenovo K5 Replacement Battery LB003 3.85V 2900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLenovo K5 Series — 3.85V Li-Polymer Replacement Battery (LB003)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 2900mAh Li-Polymer cell replacing part number LB003. It fits the Lenovo K5, K5 Dual SIM, and K350t smartphones. Capacity figures come from the product data — 11.17Wh total stored energy at rated voltage.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eK5, K5 Dual SIM, and K350t compatibility:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The K350t is a regional variant of the K5 platform — same 3.85V rail, same fuel gauge IC communication lines, same physical footprint at 77.80 × 63.14 × 3.80mm.\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 K5 unit. The BMS accepted the cell without a fault code on first power-up. Charge termination triggered correctly at full capacity and the protection circuit tripped as expected on a simulated short.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated 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 K5 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe K5 uses a fuel gauge IC that builds its charge model from the previous cell's discharge history. When you swap to a new cell, the IC still references the old curve. This causes the percentage readout to lag or jump — sometimes showing 100% when the cell isn't full, or dropping fast through the mid-range. One full discharge down to auto-shutdown followed by an uninterrupted charge to 100% forces the IC to recalibrate against the new cell. After that cycle, percentage reporting stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem fires a high-current burst — during a call, data sync, or GPS fix — and the cell voltage dips below the BMS protection threshold under that load spike. A partially calibrated fuel gauge makes this worse because the displayed percentage doesn't reflect actual remaining capacity. The fix is the same recalibration cycle: one full discharge and charge with fast charging off. If shutdowns continue past two full cycles, check that the battery connector is fully seated — a half-latched connector raises contact resistance and amplifies voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391983779930,"sku":"BWCS-LVK350SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391983812698,"sku":"BWCS-LVK350SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391983845466,"sku":"BWCS-LVK350SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LVK350SL-1.webp?v=1779142719","url":"https:\/\/batteryweb.com\/products\/lenovo-k5-replacement-battery-385v-2900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}