Pliant BeltStations Replacement Battery 3.7V 1800mAh

Pliant BeltStations / MasterBelt — 3.7V Li-ion Replacement Battery

This 3.7V 1800mAh Li-ion battery replaces the depleted cell in Pliant BeltStations and MasterBelt wireless headset units. It restores power to the audio and DECT radio circuits that handle transmission and reception. Capacity matches the original pack at 6.66Wh.

• BeltStations and MasterBelt compatibility: Both models run on the same 3.7V cell with the same physical footprint — 52.25 × 43.00 × 15.60mm. The connector pinout and BMS voltage thresholds are shared across this platform, so one cell covers both.
• Bench tested on actual hardware: We cycled this cell through combined audio and DECT radio draw — the two loads run simultaneously during active calls. The BMS held charge termination and cutoff within spec across multiple discharge cycles.
• First-charge protocol on DECT headsets: Seat the headset in the base station and let it complete one full charge cycle before making a call. The base station needs that cycle to log the new cell — until it does, the talk-time estimate on the base display will read inaccurately low.

Base station not recognising the new pack after fitting

DECT base stations log the battery's BMS state during the first full charge handshake. If the cell arrives at storage voltage — typically around 3.6–3.7V — the base may flag a charging error or show no charge activity at all. This is not a faulty cell. Place the headset in the cradle, leave it undisturbed for a full charge cycle, and the base will complete the handshake. Once logged, normal charge indication resumes.

Headset cutting out mid-call on a new battery

The BeltStations platform draws current from two sources simultaneously — the audio codec and the DECT radio transmitter. Under that combined load, a cell that has not completed conditioning cycles yet can sag below the BMS cutoff threshold briefly, dropping the headset. This typically clears after three to five full charge-discharge cycles as the cell reaches stable capacity. If cutouts persist past cycle five, check the headset's contact pins against the battery terminals — oxidised contacts increase resistance and amplify voltage sag at the cell.