Comdial 7265-HS DX-80 Cordless Phone Replacement Battery 3.6V

Comdial DX-80 — 3.6V Ni-MH Replacement Battery (7265-HS)

This is a 3.6V 700mAh Ni-MH replacement battery for the Comdial DX-80 cordless phone handset. It uses OEM part number 7265-HS and slots directly into the DX-80 handset battery compartment. The DX-80 is a business cordless phone system — this battery restores wireless operation to handsets that no longer hold a usable charge.

• DX-80 handset compatibility: The DX-80 system uses a single-cell 3.6V Ni-MH pack with a specific footprint of 46 × 31 × 10.5mm. Swapping to a cell with a different voltage or connector type causes the base station to misread charge state or refuse to charge entirely. This pack matches the original voltage rail and connector spec.
• Bench tested on actual hardware: We cycled this battery through the DX-80 base station and confirmed the BMS accepted the charge handshake without error lights. Charge current tapered correctly as the pack approached full capacity — no false termination on the first cycle.
• First-charge conditioning on NiMH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before the first call. Ni-MH cells in storage ship partially discharged — a slow first charge lets all cells in the pack reach equal voltage and hit rated capacity. Skipping this step leaves talk time below spec for the first several cycles.

Range dropping on the DX-80 after a battery swap

The DX-80 handset transmitter draws a short current spike each time it sends a DECT burst. If the battery voltage sags under that RF load, the transmitter output drops and range shrinks noticeably. A new Ni-MH pack that hasn't been properly conditioned will show higher internal resistance and sag more than a pack that has completed three to five full charge cycles. Run the pack through three full charge and discharge cycles, and voltage sag under transmit load should fall back into normal range — typically above 3.2V under load for this chemistry.

DX-80 base station showing no-charge or error light on a new battery

A Ni-MH pack that has sat in storage can drop below the voltage threshold the DX-80 base uses to detect a valid battery — usually around 3.0V or lower. When the base sees a voltage that low, it reads the pack as faulty rather than empty and shows an error instead of a charge indicator. The fix is to trickle-charge the pack externally with a compatible Ni-MH charger until it climbs above 3.1V, then reseat it in the base. At that point the base station should recognise the pack and switch to normal charging mode.