Sony PSP-S110 Replacement Battery 3.7V 1200mAh Li-ion

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

This is a 3.7V, 1200mAh Li-ion replacement for the Sony PSP-S110 battery. It fits the PSP 2th (PSP-2000), PSP-3000, and PSP Lite handhelds. Install it when the original cell no longer holds a charge or the console shuts down unpredictably mid-session.

• PSP-2000, PSP-3000, and Lite compatibility: These three PSP generations share the same battery bay dimensions, connector pinout, and charge IC handshake protocol — which is why a single PSP-S110 cell works across all of them without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a PSP-2000 unit. The BMS accepted charge immediately and cut off cleanly at the low-voltage threshold without triggering a hard shutdown loop.
• First-cycle fuel gauge calibration: After installing, run one complete play session to automatic cutoff before recharging. The PSP fuel gauge IC sets its empty reference point against the first full discharge cycle — skip this and the on-screen battery indicator will read inaccurately for weeks.

PSP fuel gauge jumping or freezing after a cell swap

The PSP uses a coulomb-counting fuel gauge IC that tracks charge in and out of the cell over time. When you swap to a new cell, that IC still holds the discharge curve data from the old, degraded battery. Until it recalibrates, the percentage readout can jump, freeze, or drop suddenly from 50% to empty. One full discharge-to-cutoff cycle followed by an uninterrupted charge to 100% resets the reference. After two to three cycles, the gauge settles to accurate readings.

Console shuts down before the battery indicator hits empty

This usually means the replacement cell is experiencing voltage sag under the PSP's peak CPU and UMD drive load combined. At high draw, terminal voltage can dip below the 3.0V cutoff threshold even when resting voltage says the cell still has capacity. Check that the battery contacts in the bay are clean and making full contact — oxidised pins add resistance and worsen sag. If the shutdowns continue after cleaning the contacts, allow two more full conditioning cycles; new cells often sag less once the electrolyte has fully wetted the electrode stack.