Edisson Piana 2.4V Ni-MH Cordless Phone Replacement Battery

Edisson Piana — 2.4V Ni-MH Replacement Battery

This is a 2.4V, 450mAh Ni-MH replacement battery for the Edisson Piana cordless phone handset. It slots into the handset battery compartment and restores cordless operation when the original cell no longer holds a charge. No OEM part number is published for this model — match by handset model name before ordering.

• Piana handset fit: The Piana runs a 2.4V two-cell Ni-MH pack at a fixed voltage rail that the base station charger targets directly. The physical dimensions — 41.97 × 18.26 × 8.89mm — must clear the battery bay and connector tab. Confirm both before fitting.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a 2.4V Ni-MH test rig. The cell voltage rose steadily through charge without peaking early, and the BMS did not flag a false full-charge state. Capacity tracked within normal Ni-MH tolerance across the first three cycles.
• First charge on the Piana base: After fitting, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in partial-discharge state need a slow, uninterrupted first charge to reach rated capacity — a quick top-up will leave the pack short of 450mAh from the start.

Range drop on the Piana after a battery swap

Ni-MH packs that haven't completed conditioning cycles show a lower resting voltage than a fully formed cell. When the handset transmits, the RF circuit draws a short current spike that sags an undercharged pack's voltage below the transmit threshold. The phone responds by cutting transmit power, which reduces range. Run three to five full charge-discharge cycles and the resting voltage stabilises — range returns to normal once the pack holds above 2.2V under RF load.

Base station shows no-charge light after fitting new battery

The Piana base reads the incoming cell voltage to decide whether to begin a charge cycle. A new Ni-MH battery from storage can sit below 2.0V — low enough that the base rejects it as a fault rather than a flat pack. Reseat the handset firmly so both charge contacts close fully. If the error light persists, leave the handset docked for 30 minutes regardless — most Piana bases trickle at a low rate first, and the charge indicator only updates once the cell climbs above the acceptance threshold of approximately 2.1V.