{"product_id":"lg-gray-c800-replacement-battery-37v-2400mah-li-ion","title":"LG Gray C800 Replacement Battery BL-48LN 3.7V 2400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG Gray C800 \/ myTouch Q Series — 3.7V Li-ion Replacement Battery (BL-48LN)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 2400mAh Li-ion battery for the LG Gray C800, myTouch Q, and myTouch Q 4G smartphones. It replaces OEM part number BL-48LN. Fit the new cell when the original no longer holds a charge or the phone shuts off unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGray C800, myTouch Q, myTouch Q 4G coverage:\u003c\/strong\u003e\n    All three models share the same BL-48LN form factor, connector pinout, and BMS handshake protocol. One replacement cell covers the full platform without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the myTouch Q platform. The BMS accepted the cell immediately, voltage held steady through screen-on and modem-active load, and the protection circuit triggered 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 installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. The fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle lets it recalibrate 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 myTouch Q reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe LG fuel gauge IC uses a coulomb counter that tracks charge relative to a learned discharge curve from the previous cell. When you swap to a new 2400mAh cell, that stored curve no longer matches the actual cell chemistry. The OS reads from the fuel gauge register, not the cell directly, so the reported percentage reflects the old model. One full discharge from 100% to automatic shutoff — without interruption — forces the IC to remap the curve to the new cell. After that cycle, percentage readings stabilise.\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 is a voltage cliff failure, not a capacity issue. Under combined screen, modem, and app load, cell voltage drops faster than the fuel gauge predicts — especially before the first recalibration cycle. When cell voltage falls below the BMS protection threshold under that load, the phone cuts power immediately even though the reported percentage looks safe. Run the recalibration cycle first. If shutdowns continue after two full cycles, check that resting cell voltage holds above 3.6V after a full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405048250458,"sku":"BWCS-LKC800XL-1","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405048283226,"sku":"BWCS-LKC800XL-2","price":31.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405048315994,"sku":"BWCS-LKC800XL-3","price":34.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKC800XL-1.webp?v=1779369883","url":"https:\/\/batteryweb.com\/products\/lg-gray-c800-replacement-battery-37v-2400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}