GP T325 Cordless Phone Replacement Battery 3.6V 500mAh

GP T325 / T347 — 3.6V Ni-MH Replacement Battery (GPF6M3BMX)

This is a 3.6V, 500mAh Ni-MH battery for GP cordless phone handsets on the T325 and T347 platforms. It replaces the OEM pack referenced under part numbers T325, T347, and GPF6M3BMX. If your handset is losing charge quickly or not powering on, this is the pack to fit.

• T325 and T347 platform compatibility: Both models run the same 3.6V single-cell Ni-MH architecture with an identical connector footprint and BMS handshake, so one pack covers either handset without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a T325 handset. The base station accepted the battery at first dock, charge current ramped normally, and the BMS terminated charge cleanly at full capacity.
• First-charge protocol for Ni-MH cordless packs: After fitting, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in storage state need a slow initial charge to reach rated capacity — skipping this step is the most common reason a new pack underperforms out of the box.

Base station charge light not coming on after fitting a new Ni-MH pack

GP cordless bases use a voltage threshold to detect whether a battery is present and ready to accept charge. A Ni-MH pack that has been in storage for months can drop below that threshold — typically under 3.0V — and the base interprets it as no battery rather than a flat one. The fix is a brief trickle charge from an external Ni-MH charger to bring the cell voltage above 3.2V. Once the pack crosses that threshold, reseat it in the base and the charge circuit will take over normally.

Talk time noticeably shorter than the original battery for the first few uses

Ni-MH cells do not deliver their rated capacity on the first charge cycle — this is normal chemistry behaviour, not a faulty pack. Rated capacity at 500mAh is typically reached after three to five full charge-and-discharge cycles. Each cycle should be a complete charge in the base followed by use until the handset signals low battery. By cycle five, the pack should stabilise at or near its rated output.