Clarity C110 Ni-MH Replacement Battery 2.4V 80mAh

Clarity C110 / C120 — 2.4V Ni-MH Replacement Battery

This is a 2.4V, 80mAh Ni-MH replacement battery for the Clarity C110 and C120 wireless headsets. It slots into the headset housing and restores audio transmission and call functionality when the original cell no longer holds a charge. Voltage and cell format match the factory specification exactly.

• C110 and C120 compatibility: Both models run the same 2.4V Ni-MH cell on the same audio and DECT radio circuit. The connector pinout and physical dimensions — 33.90 x 20.00 x 10.50mm — are shared across the pair, so one cell covers both.
• Bench tested on actual hardware: We cycled the cell through full charge and discharge on the base station, confirmed the BMS handshake completed, and verified the charge indicator cleared correctly on the base unit.
• First charge in base station: Place the headset in the base and let it complete a full charge cycle before taking a call. The base station logs the new cell during that first cycle — without it, the talk-time estimate will read low and the headset may cut off earlier than expected.

Base station not recognising the new pack

DECT base stations like the C110's use a charge handshake to register the battery before reporting status. If the cell arrives at storage voltage — typically around 2.2V for a Ni-MH pair — the base may show a charging error or no indicator at all. Seating the headset firmly in the cradle and leaving it undisturbed for the full first charge cycle usually resolves this. Once the cell climbs above the base's recognition threshold, the status LED clears and normal operation resumes.

Headset cutting out mid-call on a new battery

The C110 draws current simultaneously from the audio amplifier and the DECT radio transmitter. Under that combined load, a cell not yet conditioned can sag below the headset's low-voltage cutoff, triggering a dropout even though the charge indicator still shows partial capacity. This is a cell conditioning issue, not a fault. Run three to five full charge and discharge cycles through the base station and the sag will reduce as the Ni-MH plates stabilise — cutoff should stop occurring by cycle four at the latest.