BL-53YH LG G3 Replacement Battery 3.8V 3000mAh Li-ion

LG G3 / D855 Series — 3.8V Li-ion Replacement Battery (BL-53YH)

This is a 3.8V, 3000mAh Li-ion cell that replaces the BL-53YH battery in the LG G3 smartphone. It fits the D855, D855 LTE, D855K, and over 19 additional G3 variants. Capacity figure is taken directly from product data — 3000mAh / 11.4Wh.

• G3 and D855 series compatibility: All G3 variants on this list share the same battery bay dimensions, 3.8V nominal voltage rail, and BL-53YH connector pinout. The BMS handshake uses the same authentication line across D855, D855 LTE, and D855K, so one cell works across the full range without modification.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on a D855 unit. The BMS accepted the charge handshake without errors, held voltage above 3.6V through the discharge curve, and the charge IC did not flag overcurrent at any point.
• Fuel gauge recalibration after swap: On first use, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — preventing erratic percentage readings from the first charge forward.

Why the G3 reports wrong battery percentage after a cell swap

The G3's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, the IC still references that old curve, so reported percentage drifts away from actual charge state. The fix is one full slow-charge cycle — discharge to auto-off, then charge uninterrupted to 100% with fast charging off. After that single cycle, the coulomb counter resets its baseline against the new cell and percentage accuracy returns to normal.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display draws a current spike that drops cell voltage below the BMS cutoff threshold — even though the gauge still shows charge remaining. It is a voltage cliff, not a capacity fault. The cell cannot sustain voltage under heavy load at lower states of charge until the fuel gauge IC has fully recalibrated to the new cell curve. Run one complete discharge-charge cycle without fast charging, then verify the shutdown threshold moves — it should not trip above 15% once the gauge is calibrated.