Sony BT1002 DECT 1060 Cordless Phone Replacement Battery 2.4V 800mAh

Sony DECT 1060 / DECT 1080 — 2.4V Ni-MH Replacement Battery (BT1002)

This is a 2.4V, 800mAh Ni-MH replacement battery for the Sony DECT 1060 and DECT 1080 cordless phone handsets. It replaces OEM part numbers BT1002, BT-1002, BBTG0609001, BBTG0645001, and CBC1002. When the original cell loses capacity, this swap restores the handset to normal operation.

• DECT 1060 and DECT 1080 compatibility: Both models use the same 2.4V two-cell Ni-MH pack with identical connector orientation and housing dimensions. The base station charges via the same contact points on either handset, so one part number covers the full range.
• Bench tested on actual hardware: We ran this pack through the Sony base station charge circuit. The NiMH cells accepted the trickle charge correctly, and the handset reported full charge status without fault lights at the base.
• First-charge protocol for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cordless phone cells need this slow initial charge to reach rated capacity — skipping it locks in reduced capacity from the first cycle.

Talk time shorter than the original battery after replacement

NiMH cells ship in a partial-discharge state and take three to five full charge-discharge cycles to reach rated capacity. On cycle one, you may see noticeably shorter talk time than the original — this is normal cell behaviour, not a fault. Each full cycle conditions the electrodes and builds capacity incrementally. By cycle five, the pack should be delivering at or near the rated 800mAh.

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

NiMH batteries sit at a suppressed resting voltage after extended storage, sometimes dropping low enough that the Sony base station charge circuit does not recognise the pack as a valid NiMH cell. The base checks for a minimum voltage threshold before enabling full charge current. If the charge light fails to appear, remove the handset, wait 30 seconds, and reseat it firmly — this resets the base charge cycle. If that fails, leave the handset seated for two hours; trickle current from some base models will recover a deeply discharged pack to the recognition threshold.