Commodore T426 3.6V Cordless Phone Replacement Battery 1200mAh

Commodore 200CT Office — 3.6V Ni-MH Replacement Battery (T426)

This is a 3.6V, 1200mAh Ni-MH replacement battery for the Commodore 200CT Office cordless handset. It fits the T426 slot directly and restores talk and standby power when the original cell has degraded past usefulness. Capacity is 4.32Wh — matching the original specification.

• 200CT Office handset fit: The 200CT Office uses a single-cell Ni-MH pack at 3.6V to power the DECT radio module and handset logic. The T426 form factor matches the connector orientation and physical bay dimensions — 15 × 45 × 50mm — so no modification is needed.
• Bench tested on actual hardware: We cycled this pack through the 200CT Office base station and confirmed the BMS accepted the charge handshake without error. Voltage held stable under RF transmit load with no mid-call dropout.
• First-charge conditioning for Ni-MH packs: After installing, seat the handset in the base and leave it for a full 16-hour charge before first use. Ni-MH cells in cordless phones need a slow first charge to reach rated capacity — skipping this step leaves usable capacity on the table from day one.

Talk time shorter than the original battery after replacement

Ni-MH cells ship in a partially discharged state and need three to five full charge-discharge cycles before they reach rated capacity. On the first cycle, a new T426 pack will appear to perform below the original — this is normal cell chemistry, not a fault. Each subsequent cycle conditions the electrolyte and builds usable capacity. Run three full cycles through the base before drawing any conclusions about performance.

Base station showing no charge or error light on a new pack

Ni-MH cells that have sat in storage drop below the voltage threshold the base station uses to confirm a valid battery is present. The base reads this low resting voltage as an absent or faulty pack and refuses to initiate a charge cycle. A brief manual top-up with a standalone Ni-MH charger — enough to bring the cell above 3.0V — is enough to pass the base's acceptance check. Once the base starts charging normally, leave the handset seated for the full 16-hour initial charge.