GP 60AAK3BMS Cordless Phone Compatible Battery 3.6V 1300mAh

GP GP60AAK3BMS / GP80AAS3BMX — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 1300mAh Ni-MH battery pack for GP cordless phone handsets. It fits the GP60AAK3BMS and GP80AAS3BMX models. Swap it in when the original pack no longer holds charge and the handset dies mid-call or won't leave the base.

• GP60AAK3BMS and GP80AAS3BMX compatibility: Both handsets run a 3.6V three-cell Ni-MH pack with the same connector pinout and physical footprint — 50.57 x 42.47 x 14.35mm. The base station's charge circuit targets the same termination voltage across both models, so one pack serves either unit.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the GP handset platform. The BMS accepted charge current from the base station on the first sit-down, and voltage held steady under the RF transmit load during active calls.
• First charge after installation: Place the handset in the base for a full 16 hours before using it. Ni-MH cells in storage arrive partially discharged — a slow first charge lets each cell equalize and reach rated capacity. Skipping this step means your first few cycles will feel short.

Talk time shorter than the original battery after replacement

Ni-MH packs don't deliver full capacity on the first cycle — or the second or third. The cells need three to five full charge-and-discharge cycles before the electrodes reach their rated capacity. If talk time feels short straight out of the box, that's the chemistry, not a fault. Run the handset down to low-battery cutoff, return it to the base for a full charge, and repeat. By cycle five, capacity should be at or near 1300mAh.

Base station showing no charge or error light after fitting new pack

A Ni-MH pack that sat in a warehouse can drop to a voltage the base station reads as a fault rather than a flat battery. The base's charge circuit checks cell voltage on contact — if it reads below roughly 1.0V per cell, it may refuse to start the charge cycle. Fix: remove the battery, short the terminals briefly with a resistor or a low-current source to bleed any residual charge imbalance, then reinsert and seat the handset firmly. Most GP bases will accept the pack and begin trickle charging once cell voltage is above 1.0V per cell (3.0V total).