{"product_id":"lg-ku310-replacement-battery-37v-650mah-li-ion","title":"LG KU310 Replacement Battery 3.7V 650mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG KU310 \/ KG311 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 650mAh (2.41Wh) Li-ion replacement battery for the LG KU310 and KG311 mobile phones. It slots into either handset to restore power when the original cell has degraded or stopped holding a charge. Fit model and voltage match the original spec directly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eKU310 and KG311 compatibility:\u003c\/strong\u003e\n    Both models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail, so a single cell covers both. The BMS handshake on each device accepts the same charge profile, no firmware differences affect charging behaviour.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full discharge and charge sequence, confirming the BMS accepted the charge profile without cutoff events and that voltage held stable under simulated call and screen load.\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 any fast-charge mode and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's 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 KU310 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe KU310 uses a fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads voltage and maps it to the old curve, producing percentage figures that are off — sometimes by 15–20%. One full discharge down to automatic cutoff followed by a full charge resets the reference data the gauge uses. After that cycle, reported percentage tracks closely with actual remaining capacity.\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 fuel gauge IC is still calibrated to a worn cell with a shallow voltage cliff. The new cell has a steeper voltage drop near depletion, and under modem or screen load, terminal voltage dips below the protection threshold before the gauge shows 0%. The phone interprets that voltage sag as a fault and cuts power. Run one full supervised discharge cycle — let the phone shut itself off naturally — then charge to 100% without interruption. After that cycle the gauge recalibrates and the early-shutdown behaviour stops.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409436115034,"sku":"BWCS-LKU310SL-1","price":22.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43409436147802,"sku":"BWCS-LKU310SL-2","price":25.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43409436180570,"sku":"BWCS-LKU310SL-3","price":27.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKU310SL-big.webp?v=1779579689","url":"https:\/\/batteryweb.com\/products\/lg-ku310-replacement-battery-37v-650mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}