{"product_id":"lg-ms770-replacement-battery-37v-2400mah-li-ion","title":"LG MS770 Replacement Battery BL-44JH 3.7V 2400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG MS770 \/ Motion 4G — 3.7V Li-ion Replacement Battery (BL-44JH)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2400mAh Li-ion replacement cell for the LG MS770 and Motion 4G smartphones, also covering the P870 and US730. It matches the original BL-44JH footprint and connector. Swap it when the original cell no longer carries the phone through a full day.\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, connector pinout, and BMS handshake protocol. One cell covers the full group — no adapter or modification needed.\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 platform through charge initiation, BMS negotiation, and full discharge. The protection circuit tripped correctly at low-voltage cutoff, and charge acceptance at the standard 5V rail was confirmed without error flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use, disable fast charging and run one complete discharge-charge cycle before returning to normal use. The MS770's fuel gauge IC carries calibration data from the old cell — letting it map a full curve against the new cell's discharge profile prevents the percentage counter from drifting immediately after the swap.\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 MS770 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity defect. Under heavy modem or display load, the cell's terminal voltage drops faster than the fuel gauge predicts — the phone shuts down to protect the circuit before the reported percentage reaches zero. The fuel gauge IC is still calibrated to the old cell's discharge curve, so its percentage estimate diverges from actual cell voltage under load. One full discharge-charge cycle with no fast charging resets the coulomb counter and realigns the gauge to the new cell. After calibration, cutoffs above 15% typically stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone not powering on after the replacement battery sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells in storage self-discharge over time. If the cell dropped below 2.5V per cell, the BMS trips into lockout mode and blocks charge input entirely as a safety measure. Plug into a wall charger — not a PC USB port — and leave it connected for 15–20 minutes without pressing the power button. Most BMS circuits on this platform recover from lockout once the charge IC pushes a trickle current in, bringing cell voltage back above the 2.9V re-enable threshold before normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404346556506,"sku":"BWCS-LMS770XL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404346589274,"sku":"BWCS-LMS770XL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404346622042,"sku":"BWCS-LMS770XL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LMS770XL-1.webp?v=1779369806","url":"https:\/\/batteryweb.com\/products\/lg-ms770-replacement-battery-37v-2400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}