{"product_id":"lg-e940-replacement-battery-38v-3100mah-li-ion","title":"BL-48TH LG Optimus G Pro Replacement Battery 3.8V 3100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG Optimus G Pro — 3.8V Li-ion Replacement Battery (BL-48TH)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 3100mAh Li-ion replacement battery for the LG Optimus G Pro. It fits the E940, E980, and E977 model variants. The OEM part number is BL-48TH (also cross-referenced as EAC62058511).\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eE940 \/ E980 \/ E977 compatibility:\u003c\/strong\u003e\n    These variants 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 battery on the E940 and monitored the BMS through charge and load. The protection circuit responded correctly to cutoff at full charge and held voltage under screen and modem load without tripping.\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-to-charge cycle. The E940's fuel gauge IC calibrates against the cell's discharge curve — skipping this step leaves the coulomb counter reading the old cell's profile, which causes erratic percentage jumps early on.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the Optimus G Pro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe E940 pulls heavy current when the modem is active and the screen is at full brightness. A new cell with an uncalibrated fuel gauge IC can show 25% remaining while the actual cell voltage has already dropped to the BMS cutoff threshold — around 3.0V under load. The phone interprets this as a hard shutdown, not a low-battery warning. One full discharge-charge cycle after installation lets the coulomb counter anchor to the new cell's actual voltage curve and fixes this.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eOS percentage jumping erratically in the first two days after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Optimus G Pro's fuel gauge IC stores a learned discharge profile from the old cell. When a new cell goes in, the stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The OS reads the mismatch as unstable state-of-charge data, so the percentage display skips around. Drain the battery to below 5% until the phone shuts off, then charge uninterrupted to 100% — this forces the IC to write a fresh calibration baseline against the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404256378970,"sku":"BWCS-LKE980XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404256411738,"sku":"BWCS-LKE980XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404256444506,"sku":"BWCS-LKE980XL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKE980XL-1.webp?v=1779369511","url":"https:\/\/batteryweb.com\/products\/lg-e940-replacement-battery-38v-3100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}