GP T266 Cordless Phone Replacement Battery 2.4V 700mAh

GP T266 / 7M2BZ — 2.4V Ni-MH Replacement Battery for Cordless Phone

This is a 2.4V, 700mAh Ni-MH battery pack for GP cordless phone handsets. It fits the T266, 7M2B7, 8M2B7, and Enix E4H models. Swap it in when the original pack no longer holds a charge through a normal call.

• T266, 7M2B7, 8M2B7, and Enix E4H handsets: These models share the same 2.4V dual-cell NiMH architecture, identical connector pinout, and matching physical footprint — one pack fits the full group without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench. The BMS accepted charge from a standard base station cradle at the expected trickle rate, and cell voltage stabilised at 2.4V nominal across both cells after conditioning.
• First charge after install: Place the handset in the base station for a full 16 hours before your first call. NiMH cells in cordless phones arrive partially discharged from storage — a slow first charge lets both cells reach rated capacity together and prevents one cell from lagging the other.

Talk time shorter than the original battery after replacement

NiMH cells need three to five full charge and discharge cycles before they hit rated capacity. On cycle one, you may see noticeably shorter talk time — this is normal cell conditioning, not a fault. Each cycle the cells accept slightly more charge than the last. By cycle five, capacity should be at or close to the 700mAh rating.

Base station showing no-charge or error light after swap

A new NiMH pack sitting in storage can drop to a voltage the base station reads as a fault condition rather than a dischargeable battery. The base's charge controller checks incoming voltage before starting the charge cycle — if it sees too low a reading, it stalls. Remove the handset, wait 30 seconds, and reseat it firmly. If the error persists, the pack may need a brief external boost to 2.0V before the base will accept it.