Sony PSP-S110 Replacement Battery 3.7V 1800mAh

Sony PSP-2000 / PSP-3000 Series — 3.7V Li-Polymer Replacement Battery (PSP-S110)

This is a 3.7V, 1800mAh lithium-polymer replacement for the Sony PSP-S110 battery. It fits the PSP-2000, PSP-3000, and PSP Lite handheld consoles. Install it when the original cell no longer holds a charge or fails to power the unit past the boot screen.

• PSP-2000 and PSP-3000 cross-compatibility: Both generations use the same 3.7V single-cell Li-Polymer architecture, the same physical connector pinout, and the same BMS handshake protocol — which is why one part number covers both platforms.
• Bench tested on actual hardware: We ran this cell on a PSP-2000 and PSP-3000 unit. The console's charge IC accepted the cell without error flags, and the BMS responded correctly to both charge termination and low-voltage cutoff events.
• Fuel gauge reset after swap: The PSP fuel gauge IC calibrates its empty reference point against the first full discharge cycle on a new cell. After installing, run one complete play session to automatic console cutoff before recharging — this sets the baseline the gauge reads against for all future sessions.

PSP battery percentage jumping or freezing after cell replacement

The PSP uses a coulomb-counting fuel gauge IC that builds its discharge model from stored cycle history. When you swap the physical cell, the IC still holds the old cell's discharge curve in memory. It compares incoming voltage readings against a map that no longer matches the new cell, so the percentage display jumps, freezes, or reads full then drops suddenly. One complete discharge to automatic cutoff followed by a full charge overwrites the reference map and brings the gauge back into step with the new cell.

PSP shuts off during heavy load despite showing charge remaining

During graphically intensive games or UMD drive spins, the PSP draws peak current that causes a momentary voltage sag at the cell terminals. If the cell is cold, partially discharged, or still in its first few conditioning cycles, that sag can dip below the BMS cutoff threshold — around 3.0V — and the console shuts down even though the gauge showed battery remaining. Warm the unit to room temperature before a session and complete three to five full charge-discharge cycles to bring the cell to rated capacity. After conditioning, voltage sag under peak load stays above the 3.0V floor.