Sony PSP CECHZK1GB Replacement Battery LIS1446 3.7V 800mAh

Sony CECHZK1GB — 3.7V Li-ion Replacement Battery (LIS1446)

This is a 3.7V 800mAh Li-ion replacement for the LIS1446 cell inside the Sony PSP CECHZK1GB. It fits the handheld directly and restores portable play when the original cell no longer holds a usable charge. Voltage and connector match the OEM spec.

• CECHZK1GB platform fit: The CECHZK1GB uses a specific cell footprint — 46.00 × 35.72 × 5.10 mm — with a connector wired to match the PSP's charge management IC. Any variance in thickness or pin order causes the unit to reject the cell or refuse to power on.
• Bench tested on actual hardware: We ran this cell on a CECHZK1GB unit and confirmed the BMS accepted the charge handshake without throwing a fault. The console powered on cleanly and the charge IC reached the correct termination voltage.
• Fuel gauge calibration on first install: After fitting this cell, run one complete play session to automatic cutoff before plugging in. The PSP's fuel gauge IC sets its empty reference point against the first full discharge cycle — skipping this step causes the indicator to read incorrectly for weeks.

PSP fuel gauge jumping or freezing after a cell swap

The CECHZK1GB tracks charge state using a coulomb-counter IC tied to the original cell's discharge curve. When a new cell goes in, that curve no longer matches the stored reference values, so the gauge reads erratically — jumping from 80% to 20% or freezing mid-session. This is not a fault with the replacement cell. One full discharge-to-cutoff cycle followed by a full charge resets the reference and tightens the gauge reading. After two or three cycles the display stabilises.

Console cuts out before the battery indicator reaches empty

New Li-ion cells can show a steeper voltage drop at end-of-charge than a worn cell, which the PSP's low-voltage cutoff interprets as an emergency shutdown threshold. The console cuts power even though the gauge still shows bars remaining. This resolves as the cell's internal resistance settles over the first three to five charge cycles. If early cutoff persists beyond five cycles, check that the battery connector is fully seated — a partially mated connector adds resistance and pulls the terminal voltage down under load. Target resting voltage after a full charge is 4.2V.