Commodore 250 Cordless Phone Replacement Battery 3.6V 1200mAh

Commodore 250 — 3.6V Ni-MH Replacement Battery

This is a 3.6V 1200mAh Ni-MH rechargeable battery for the Commodore 250 cordless phone handset. It powers the handset during calls and standby. Swap it in when your handset no longer holds a useful charge or needs charging multiple times a day.

• Commodore 250 handset fit: The 250 handset uses a compact 3.6V Ni-MH cell pack at this exact form factor — 52.99 x 44.48 x 15.15mm. The voltage rail and connector position match the original. No modification required.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a DECT phone test rig. The BMS accepted charge without error flags, and voltage held stable under simulated RF transmit load through the first three cycles.
• First-charge conditioning for Ni-MH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cordless phone batteries reach rated capacity only after a slow initial charge — skipping this shortchanges every cycle that follows.

Base station showing no charge light on a new Ni-MH pack

Ni-MH batteries lose voltage during storage. If the pack arrives below roughly 3.0V, some base stations won't initiate a charge cycle — they read the voltage as out of range and do nothing. This isn't a fault in the base or the battery. The fix is to briefly charge the pack using a standalone Ni-MH charger to bring it above the acceptance threshold, then return it to the base. Once the pack reaches around 3.3V, the base will recognise it and take over charging normally.

Talk time still short after three or four charges

Ni-MH cells don't deliver rated capacity straight out of the box — they need conditioning cycles to reach full charge acceptance. If talk time feels short after the first few charges, that's expected behaviour, not a defective battery. Run three to five full charge-and-use cycles with the handset seated in the base between calls. By cycle five, capacity should stabilise near the rated 1200mAh and talk time will reflect that.