Radio Shack 960-1357 Cordless Phone Replacement Battery 3.6V

Radio Shack 960-1357 — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1500mAh Ni-MH replacement battery for Radio Shack cordless phones using OEM part number 960-1357. It fits the handset directly, restoring talk and standby operation when the original pack can no longer hold a charge. Voltage and chemistry match the original spec exactly.

• Radio Shack 960-1357 handset compatibility: These handsets share a common 3.6V NiMH cell arrangement with a standard connector and BMS that accepts the same charge profile — swapping this pack requires no reconfiguration of the base station.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a cordless phone handset platform. The BMS accepted charge input from the base cradle on the first attempt and held voltage within spec across the full discharge curve.
• First-charge conditioning for NiMH: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones don't reach rated capacity on the first cycle — this slow initial charge lets the cells condition properly and deliver their full 1500mAh over subsequent cycles.

Base station charging error on a fresh NiMH pack

Radio Shack base stations use a voltage threshold to detect a handset battery before starting the charge cycle. A new NiMH pack that has been in storage can sit below that threshold — typically under 3.0V — and the base reads it as a fault rather than a dischargeable battery. This isn't a defective pack. Place the handset in the base anyway and leave it undisturbed for several hours; most bases will re-poll the battery and begin charging once the resting voltage climbs above the acceptance window.

Range dropping mid-call after a battery swap

DECT handsets regulate transmit power based on available voltage from the battery. When a NiMH pack hasn't been fully conditioned, its voltage sags under the RF load of an active call — the handset drops transmit power to compensate, and range shrinks noticeably. This is most common in the first three to five charge cycles. Run the pack through full charge-discharge cycles without interrupting mid-cycle, and range stabilises as the cells reach their rated 1500mAh output.