{"product_id":"lg-ms770-replacement-battery-37v-1200mah-li-ion","title":"LG MS770 Replacement Battery 3.7V 1200mAh BL-44JH","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG MS770 \/ Motion 4G \/ P870 — 3.7V Li-ion Replacement Battery (BL-44JH)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1200mAh Li-ion cell built to the BL-44JH spec, fitting the LG MS770, Motion 4G, P870, US730, and over 45 additional LG handsets. It replaces the original EAC61839001 and EAC61839006 OEM cells. Install it when the original cell no longer holds voltage under screen or modem load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMS770 \/ Motion 4G platform fit:\u003c\/strong\u003e\n    These models share the same battery bay dimensions (65.20 × 44.00 × 4.80mm), the same 3.7V nominal voltage rail, and the same connector pinout — so one cell covers the full group without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on the MS770 and confirmed the BMS handshake completed cleanly, charge IC accepted current without error flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold.\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 full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins against an uncalibrated coulomb counter.\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 LG MS770 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe MS770's fuel gauge IC retains the discharge curve of the old cell in memory. When a new cell is installed, the IC's stored curve no longer matches actual cell voltage behaviour. Under modem or display load, the cell voltage dips below the threshold the IC expects at that percentage — and the phone cuts power before the gauge reaches zero. This is a calibration mismatch, not a faulty cell. One full discharge cycle from 100% to auto-shutoff, followed by a full charge, forces the coulomb counter to rebuild its curve against the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone won't power on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage. If the cell voltage dropped below approximately 2.5V, the BMS enters lockout mode to prevent damage — and the phone will not respond to the power button. Connect the phone to a wall charger, not a PC USB port, and leave it for 15–20 minutes without attempting to power on. The charge IC needs enough current headroom to nudge the cell above the BMS re-enable threshold, which sits around 2.9–3.0V on this platform.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405012500570,"sku":"BWCS-LKP700SL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405012533338,"sku":"BWCS-LKP700SL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405012566106,"sku":"BWCS-LKP700SL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKP700SL-1.webp?v=1779369806","url":"https:\/\/batteryweb.com\/products\/lg-ms770-replacement-battery-37v-1200mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}