Sony BP-T23 Cordless Phone Compatible Battery 3.6V 2000mAh

Sony SPP-10910 / SPP-900 Series — 3.6V Ni-MH Replacement Battery (BP-T23)

This is a 3.6V, 2000mAh Ni-MH battery pack for Sony cordless phone handsets. It fits the SPP-10910, SPP-900, SPP-910, SPP-930, and over 39 additional Sony SPP-series models. The BP-T23 and BP-T93 are the OEM part numbers this pack replaces.

• SPP-900 series compatibility: These handsets share the same 3.6V three-cell Ni-MH format, the same connector orientation, and the same base station charge current profile — which is why one pack covers the entire SPP line from the 900 through the 930 and 10910.
• Bench tested on actual hardware: We ran this pack through the SPP base station charge cycle and confirmed the BMS accepted the charge handshake without error. Discharge curves stayed flat through the midpoint before the expected Ni-MH voltage drop near depletion.
• First-charge protocol for Ni-MH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Sony's SPP base stations deliver a slow trickle charge — cutting that short on a new Ni-MH pack means the cells never reach rated capacity on early cycles.

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. Most users install the battery, make a few calls, and assume something is wrong — but the pack is still conditioning. Each cycle, the cells accept slightly more charge. By cycle five, capacity should be at or near the 2000mAh rating. Run full cycles without leaving the handset idle in the base for days between calls to get through the conditioning phase faster.

Base station shows no charge light or error indicator on a new pack

Ni-MH packs lose voltage during storage — if the pack voltage drops low enough, the SPP base station's charge circuit may not recognise it as a valid battery and won't initiate a charge. Remove the handset, wait 30 seconds, and reseat it firmly. If the base still shows no charge activity, check that the handset contacts are clean and making solid contact with the base pins. A brief trickle from a known-good charger at 100mA for 15 minutes can bring a deeply discharged Ni-MH pack back above the base station's acceptance threshold — typically around 3.0V for a three-cell pack.