{"product_id":"lg-p940-replacement-battery-37v-1700mah-li-ion","title":"BL-44JR Replacement Battery LG P940 3.7V 1700mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG Prada 3.0 \/ P940 \/ SU880 — 3.7V Li-ion Replacement Battery (BL-44JR)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1700mAh Li-ion cell built to replace the OEM BL-44JR battery in the LG Prada 3.0, P940, K2, and SU880 smartphones. The BL-44JR sits in a narrow shared platform across these LG models — same connector, same BMS handshake protocol, same physical footprint at 65.20 × 44.00 × 4.70mm. When the original cell degrades, voltage sag under screen and modem load becomes the first failure sign.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrada 3.0 \/ P940 platform fit:\u003c\/strong\u003e\n    These models share a common power rail at 3.7V nominal and use the same BMS communication line to the charge IC. The BL-44JR connector locks to the same board header across all listed variants, so no adapter or modification is needed.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge cycles on this cell against the P940 charge IC and confirmed the BMS negotiation completes correctly — the device registers the battery, accepts charge current, and reports state-of-charge without error flags on the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing a new cell, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on the P940 is calibrated to the old cell's discharge curve — one complete cycle lets it remap against the new cell before high-current charging begins.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the P940 reports the wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe P940 uses a coulomb counter inside the fuel gauge IC that tracks charge based on the previous cell's internal resistance and discharge profile. A new BL-44JR cell has different impedance characteristics, so the IC's stored model no longer matches what it's measuring. This mismatch shows up as percentage jumps, early \"low battery\" warnings, or a reading that stalls at one value for extended periods. One full discharge cycle — down to auto-shutdown, then a full charge — forces the IC to relearn the new cell's curve.\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 hasn't recalibrated yet and the cell hits a voltage cliff under simultaneous modem and display load. The P940's processor draws a short current spike that the uncalibrated cell can't sustain, dropping cell voltage below the BMS cutoff threshold even though the displayed percentage reads mid-range. The phone shuts down as a protection event, not a true dead cell. Run one full discharge-to-shutdown cycle, recharge to 100%, and the cutoff voltage should align with the updated fuel gauge model — typically resolving shutdowns above 3.4V per cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404230066266,"sku":"BWCS-LKP940XL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404230099034,"sku":"BWCS-LKP940XL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404230131802,"sku":"BWCS-LKP940XL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKP940XL-1.webp?v=1779369448","url":"https:\/\/batteryweb.com\/products\/lg-p940-replacement-battery-37v-1700mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}