Sony PSP-1000 Replacement Battery 3.7V 1800mAh Li-ion PSP-110

Sony PSP-1000 Series — 3.7V Li-ion Replacement Battery (PSP-110)

This is a 3.7V, 1800mAh Li-ion cell built to the PSP-110 spec. It fits the Sony PSP-1000, PSP-1000G1, PSP-1000G1W, PSP-1000K, and four additional PSP-1000 variants. If the original battery no longer holds a charge or swells, this is the direct cell replacement.

• PSP-1000 variant compatibility: All PSP-1000 sub-models share the same battery bay dimensions, connector pinout, and 3.7V supply rail. The BMS handshake across these variants is identical, so one cell covers the full PSP-1000 hardware generation.
• Bench tested on actual hardware: We ran this cell in a PSP-1000 unit and monitored BMS communication through charge and discharge cycles. The protection circuit tripped correctly at the low-voltage cutoff threshold and accepted charge current from both OEM and aftermarket AC adapters without fault flags.
• First-cycle calibration on the PSP-1000: After installing, run one full wireless play session through to automatic cutoff before recharging. The PSP-1000 fuel gauge IC sets its empty reference point against the first full discharge cycle — skipping this step leaves the gauge reading inaccurate for weeks.

Why the PSP-1000 fuel gauge jumps after a cell swap

The PSP-1000 uses a coulomb-counting fuel gauge IC that tracks charge in and out of the original cell over its lifetime. When a new cell goes in, the IC still holds the old cell's discharge curve in memory. Until it re-learns the new cell's actual voltage-to-capacity curve, the percentage display will jump, drop suddenly, or stall at a fixed number. Two to three full discharge-and-recharge cycles force the IC to update its reference data and stabilise the readout.

PSP-1000 charging at a trickle after battery replacement

On the first charge with a new cell, the PSP-1000 charge IC applies a reduced current rate — this is a precondition stage the hardware uses when it sees a cell starting from a low state of charge. It is not a fault. Full charge current resumes once the cell voltage climbs past approximately 3.0V, which typically happens within the first 15–20 minutes of charging. If the reduced rate persists beyond the first cycle, check that the battery contacts are fully seated and free of oxidation.