{"product_id":"lg-v40-replacement-battery-385v-3400mah-li-polymer","title":"LG V40 BL-T41 Replacement Battery 3.85V 3400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG V40 ThinQ — 3.85V Li-Polymer Replacement Battery (BL-T41)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3400mAh, 3.85V lithium-polymer replacement battery for the LG V40 ThinQ smartphone. It carries OEM part number BL-T41 and fits the V40, V405UAB, V40 ThinQ, and V40 ThinQ VZW LTE-A, along with 24 additional V40 variants. Capacity is rated at 13.09Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eV40 ThinQ platform fit:\u003c\/strong\u003e\n    All V40 variants in this lineup share the same BL-T41 footprint, voltage rail, and BMS handshake. The connector pinout and cell dimensions — 84.80 × 42.40 × 5.10mm — are consistent across the full V40 series, so one cell covers the entire platform.\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 V40 hardware. The BMS accepted charge initiation without error, current tapered correctly at top-of-charge, and the protection circuit tripped cleanly at the low-voltage cutoff — no false flags from the fuel gauge IC.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current fast charging pushes current into 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\"\u003eSudden shutdown at 20–30% on the V40 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff problem, not a capacity problem. The V40's Snapdragon 845 and modem draw a sharp current spike under LTE load or screen-on events. If the fuel gauge IC is still calibrated to the old cell's discharge curve, it reports 25% remaining while the new cell's actual voltage drops below the shutdown threshold under load. The phone cuts out before the OS has time to log a low-battery warning. Run one full discharge to near-zero, then charge uninterrupted to 100% — this recalibrates the coulomb counter to the new cell curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not accepted on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter installing a new BL-T41 cell, some V40 units refuse fast charge on the first plug-in — the charging icon shows standard rate even with a Qualcomm Quick Charge brick. The charge IC runs a brief handshake with the BMS on a fresh cell and defaults to a conservative current limit until it confirms cell health. This is normal behaviour, not a fault. Charge once at standard rate to completion, then reconnect with your fast-charge adapter — the IC will accept the higher current rate from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392000557146,"sku":"BWCS-LKG820SL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392000589914,"sku":"BWCS-LKG820SL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392000622682,"sku":"BWCS-LKG820SL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKG820SL-1.webp?v=1779142855","url":"https:\/\/batteryweb.com\/products\/lg-v40-replacement-battery-385v-3400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}