Sanyo GESPC902 Cordless Phone Replacement Battery 3.6V 2000mAh

Sanyo GESPC902 / GESPC915 — 3.6V Ni-MH Replacement Battery

This 3.6V, 2000mAh Ni-MH pack replaces the Sanyo GESPC902 and GESPC915 batteries used in compatible cordless DECT phone handsets. It delivers the same voltage rail and cell chemistry as the factory pack, so the handset and base station treat it as a native cell. Capacity is rated at 7.2Wh from our product data.

• GESPC902 and GESPC915 compatibility: Both OEM part numbers share the same 3.6V three-cell Ni-MH configuration, connector pinout, and physical footprint — 53.60 × 42.45 × 15.32mm — so one pack covers both variants without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a cordless handset platform. The BMS accepted charge from the base station cradle on the first insertion, with no fault flag or error light triggered during the test run.
• First-charge protocol for Ni-MH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells arriving from storage are partially discharged — a slow full charge on the first cycle lets the cells reach rated capacity and sets the baseline for accurate charge-state tracking by the base station.

Talk time shorter than original battery after replacement

Ni-MH cells do not reach full rated capacity on the first charge cycle — this is normal cell behaviour, not a fault. Fresh Ni-MH packs typically deliver 60–80% of rated capacity for the first three to five cycles, then settle at full capacity once the cells have been properly conditioned. Each full charge-and-discharge cycle pushes the cells closer to their 2000mAh rating. If talk time is still noticeably short after five full cycles, check that the handset is sitting flush in the base cradle so the charge contacts are making solid connection.

Base station showing no charge light or error after swap

When a Ni-MH pack arrives deeply discharged from storage, its terminal voltage can fall below the threshold the base station uses to confirm a valid battery is present — the charger circuit sees the low voltage as a fault rather than an empty cell. Remove the handset, wait 30 seconds, and reseat it firmly so the charge contacts reset. If the error light persists, check the resting voltage of the pack with a multimeter — it should read above 3.0V for the base to accept it. A reading below 3.0V means the pack needs a recovery charge through a compatible external Ni-MH charger before being placed back in the base.