About this replacement
Sony PS3 Wireless Qwerty Keypad — 3.7V Li-ion Replacement Battery (MK11-3023)
This 3.7V 570mAh Li-ion cell replaces the internal battery in the Sony PS3 Wireless Qwerty Keypad. It fits the CECHZK1UC and CECHZK1JP models, as well as units referenced by OEM part numbers MK11-2903 and MK11-2902. If your keypad no longer holds a charge or dies quickly after unplugging from the PS3 USB port, this is the cell to replace.
- CECHZK1UC and CECHZK1JP compatibility: Both regional variants use the same 3.7V single-cell configuration and identical connector pinout. The BMS on each accepts this cell without modification or firmware differences between regions.
- Bench tested on actual hardware: We ran this cell in a CECHZK1UC unit and confirmed the BMS accepted charge from the PS3 USB port at 5V input, balanced correctly at 4.2V, and engaged the low-voltage cutoff at approximately 3.0V as expected.
- Post-swap reconnection on PS3: After replacing the internal battery, the keypad may drop its active Bluetooth session. Re-pair by holding the keypad's Connect button and re-selecting it through the PS3 accessory settings menu — this is a Bluetooth session reset, not a hardware fault.
Keypad pairing lost after battery replacement
Swapping the internal cell causes a full power loss, which clears the active Bluetooth pairing stored in the keypad's volatile memory. The PS3 retains its paired device list, but the keypad itself forgets the session. To restore it, hold the Connect button on the keypad until the indicator flashes, then navigate to PS3 Settings → Accessory Settings → Manage Bluetooth Devices and re-register the keypad. This is a one-time step after any full power interruption.
Keypad input lag or dropped characters at low charge
When cell voltage drops below roughly 3.2V, the Bluetooth transmitter in the keypad reduces its polling rate to conserve power. This shows up as delayed keystrokes or characters that don't register during fast typing. It is not a pairing issue — it is the radio pulling back under low voltage. Charging the keypad via the PS3 USB port until the indicator shows full resolves it immediately.