Walker W425 Cordless Phone Replacement Battery 3.6V 700mAh

Walker W425 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 700mAh Ni-MH battery for the Walker W425 cordless phone handset. It replaces the original cell pack when the handset no longer holds a charge or powers on reliably. Dimensions are 45.60 x 31.30 x 10.60mm — measure your existing cell before ordering if you are unsure.

• W425 handset fit: The W425 uses a 3-cell Ni-MH pack at 3.6V to run the DECT radio module and handset logic board. This replacement matches that voltage and physical footprint so the battery seats correctly in the compartment without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH compatible charger. The BMS accepted charge normally and the cell voltage stabilised at 3.6V nominal across full cycles without cutoff trips.
• First charge on the W425: After installing, seat the handset in the base station and leave it for a full 16 hours before first use. Ni-MH cells shipped in a partial-discharge state will not reach rated capacity on a short charge — the slow first cycle lets the cells balance properly.

Range drop on the W425 after a battery swap

The W425 DECT radio pulls a short current spike every time it transmits. A Ni-MH cell that has not completed its first full conditioning cycle has higher internal resistance than a fully conditioned pack. That resistance causes the voltage to sag briefly under RF load, and the radio backs off transmit power to compensate. Run three to five full charge and discharge cycles to let internal resistance drop to its rated level.

Handset not pairing with the base after battery replacement

Removing the battery cuts all power to the W425 handset, which can wipe the DECT pairing registration stored in volatile memory. The base station and handset each hold a shared access rights key — when both sides lose sync, the handset shows no line or fails to connect to the base. To re-pair, press and hold the registration button on the base unit until the indicator flashes, then initiate handset registration from the phone menu. Check your W425 manual for the exact key sequence if the menu label differs.