{"product_id":"lg-p880-replacement-battery-37v-1800mah-li-ion","title":"LG P880 Optimus 4X HD Replacement Battery BL-53QH 3.7V","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLG Optimus 4X HD \/ Optimus LTE II — 3.7V Li-ion Replacement Battery (BL-53QH)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1800mAh Li-ion replacement cell for the LG P880 (Optimus 4X HD) and Optimus LTE II \/ LTE 2 series. It slots into the same battery bay as the original BL-53QH and uses the same three-contact connector layout. Capacity is 1800mAh — matching the stock specification across all listed fit models.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eP880 and Optimus LTE II 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 listed range without adapter or modification.\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 the P880 platform. The protection circuit triggered correctly at low-voltage cutoff, and charge termination fired at the expected 4.2V ceiling with no thermal anomalies noted.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge to automatic shutdown, then charge uninterrupted to 100% before normal use. The P880's fuel gauge IC was calibrated to your old cell's discharge curve — skipping this step causes the percentage readout to drift or jump for the first several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the P880 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe P880 uses a coulomb-counter-based fuel gauge IC that tracks charge state relative to the cell it learned on. When you fit a new cell, the IC still references the old discharge curve, so percentage readings drift — often showing 100% when the cell is partially charged, or dropping suddenly near the end. A single full discharge-to-shutdown followed by an uninterrupted charge to 4.2V forces the IC to recalibrate against the new cell. After one complete cycle, percentage accuracy normalises. No third-party app or reset is needed — the hardware corrects itself through the cycle.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem, screen backlight, or GPS pulls a current spike the cell voltage cannot sustain — the terminal voltage drops below the protection circuit's cutoff threshold even though the fuel gauge still shows charge remaining. It is a voltage-sag issue, not a faulty cell. On a new cell that has not completed its first calibration cycle, the BMS cutoff appears earlier because the IC does not yet know the cell's true low-voltage knee. Complete one full discharge-charge cycle first. If shutdown still occurs below 3.2V under load after two full cycles, check that no background process is spiking draw during the affected percentage window.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405011779674,"sku":"BWCS-LKP880XL-1","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405011812442,"sku":"BWCS-LKP880XL-2","price":28.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405011845210,"sku":"BWCS-LKP880XL-3","price":31.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LKP880XL-1.webp?v=1779369806","url":"https:\/\/batteryweb.com\/products\/lg-p880-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}