{"product_id":"leagoo-elite-5-replacement-battery-38v-3800mah-li-ion","title":"Leagoo Elite 5 BT-557P Compatible Battery 3.8V 3800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLeagoo Elite 5 — 3.8V Li-ion Replacement Battery (BT-557P)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V Li-ion cell rated at 3800mAh (14.44Wh), built to the BT-557P specification for the Leagoo Elite 5 smartphone. It replaces the original battery when the cell has degraded, lost capacity, or stopped holding a charge. Voltage and connector match the Elite 5 board directly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eElite 5 fit:\u003c\/strong\u003e\n    The Elite 5 uses a sealed back panel with a specific connector orientation and BMS handshake tied to the BT-557P cell profile. Using a mismatched cell can trigger immediate charge rejection at the PMIC level, regardless of voltage match.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through a full charge-discharge sequence on the Elite 5 board and confirmed the BMS accepted the cell, the charge IC reached termination voltage correctly, and the protection circuit tripped at the expected overcurrent 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 complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC pushes high current into an uncalibrated cell — preventing erratic percentage readings from the first charge onward.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Elite 5 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe Elite 5 uses a coulomb counter-based fuel gauge IC that builds its capacity model against the original cell's discharge curve. When you install a new cell, the IC still references that old curve, so the displayed percentage drifts from actual state of charge. This usually appears as the phone jumping from 40% to 5% without warning, or showing 100% for an unusually long stretch. One full discharge-charge cycle without fast charging resets the IC's learned curve to the new cell and corrects the reported percentage within two to three cycles.\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 modem, screen, and processor load, the cell voltage drops faster than the fuel gauge IC predicted — falling below the PMIC's cutoff threshold while the display still reads 20–30%. The root cause is an uncalibrated fuel gauge reading a new cell curve as if it were the old degraded one. Let the phone discharge fully to auto-shutdown, then charge uninterrupted to 100% — this single cycle gives the IC enough data to recalculate the cliff point accurately. After two full cycles, shutdowns below 15% should stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392033128538,"sku":"BWCS-LGE400SL-1","price":29.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43392033161306,"sku":"BWCS-LGE400SL-2","price":33.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43392033194074,"sku":"BWCS-LGE400SL-3","price":36.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LGE400SL-1.webp?v=1779143030","url":"https:\/\/batteryweb.com\/products\/leagoo-elite-5-replacement-battery-38v-3800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}