GP 3.6V Cordless Phone Replacement Battery GP60AAK3BMS 700mAh

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

This is a 3.6V 700mAh Ni-MH battery pack for cordless phones using GP OEM part numbers GP60AAK3BMS or GP80AAS3BMX. It fits handsets that take either of these packs directly. Voltage, connector, and cell count match the original spec.

• GP60AAK3BMS and GP80AAS3BMX compatibility: Both part numbers share the same 3.6V three-cell NiMH configuration and connector footprint. Handsets built around either OEM pack accept this replacement without modification to the battery bay or charging contacts.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a NiMH-compatible bench charger. The BMS held stable at 3.6V nominal and accepted the trickle charge rate the base station applies during standby topping.
• First-charge protocol for NiMH cordless packs: After installing, seat the handset in the base for a full 16-hour charge before first use. NiMH cells in cordless phone packs need a slow initial charge to reach rated capacity — skipping this leaves cells mismatched and shortens overall pack life.

Base station charge light staying red or showing error after swap

NiMH packs lose voltage during storage. If the pack sits in a warehouse for several months, its resting voltage can drop below the threshold the base station uses to confirm a valid battery is present. Some bases will flash an error light or refuse to begin a charge cycle when they detect voltage below roughly 3.0V. Seating the handset and leaving it undisturbed for 30 minutes usually allows the base to detect a slow recovery and begin trickle charging. If the error persists, remove the handset for 10 seconds and reseat it firmly until the contacts click.

Talk time shorter than expected for the first few uses

NiMH cells require three to five full charge-discharge cycles before they reach rated capacity — 700mAh in this pack. On the first and second cycle, you will get noticeably shorter talk time than the original battery delivered at its best. This is a chemistry characteristic, not a defect. Run the handset until the low-battery alert sounds, return it to the base for a full overnight charge, and repeat. By cycle four or five, capacity stabilises at the rated figure.