About this replacement
LG Optimus 2X / P990 Series — 3.7V Li-ion Replacement Battery (SBPL0103001)
This 3.7V Li-ion battery replaces the original cell in the LG P990, Optimus 2X, Optimus Speed, and Star smartphones. Capacity is 2400mAh (8.88Wh), matching the original specification. It fits the standard compartment and connects via the OEM-spec contact plate without modification.
- P990 / Optimus 2X / Speed / Star compatibility: All four models share the same battery bay dimensions, 3.7V voltage rail, and three-pin contact layout. The SBPL0103001 and FL-53HN part numbers both cross-reference to this cell, so the same unit covers every variant in the group.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on the P990 platform. The BMS accepted a standard charge cycle without triggering overcurrent cutoff, and the protection circuit responded correctly to low-voltage termination at the expected threshold.
- Fuel gauge recalibration after install: On first use, disable any fast-charge adapter and run one complete discharge down to auto-shutdown, then charge uninterrupted to 100%. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging is introduced into an uncalibrated state.
Sudden shutdown at 20–30% on the P990 after a cell swap
The P990's fuel gauge IC was calibrated to the original cell's internal resistance and discharge curve. A new cell has different impedance characteristics, so the IC misreads remaining capacity and trips shutdown before the cell is actually empty. This appears as an abrupt power-off at 20–30% with no warning. One full discharge-charge cycle corrects the coulomb counter and moves the shutdown point back to the correct low-voltage threshold near 3.0V per cell.
OS percentage jumping erratically in the first week after replacement
Erratic percentage readings — jumping from 45% to 60% or dropping 15 points instantly — point to the fuel gauge IC working from a stale discharge model stored in memory from the old cell. The IC uses accumulated charge and discharge data to estimate state of charge, and that data does not reset automatically on a cell swap. Two to three full discharge-charge cycles flush the old model and let the IC rebuild an accurate curve. After the third cycle, percentage readout stabilises and tracks linearly with actual voltage.