Agfeo AK320A Wireless Headset Compatible Battery 3.7V 320mAh

Agfeo IP Multi-Cell — 3.7V Li-Polymer Replacement Battery (AK320A)

This 3.7V, 320mAh lithium-polymer cell replaces the internal battery in the Agfeo IP Multi-Cell and Multi-Cell Headset. At 37.00 × 25.00 × 4.50mm, it matches the original footprint for a direct fit inside the headset housing. Swap it when the original pack no longer holds charge through a full shift.

• IP Multi-Cell and Multi-Cell Headset compatibility: Both models share the same 3.7V cell format, connector pinout, and BMS handshake protocol — one battery covers the full range without any modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the IP Multi-Cell base station and confirmed the BMS completed handshake, accepted the full charge curve, and released cleanly on discharge without premature cutoff.
• First-cycle base station logging: Seat the headset in the base station and let it run a full charge cycle before taking a call. DECT headsets log the new cell during that first cycle — until it completes, the talk-time indicator on the base will not read accurately.

Why the IP Multi-Cell headset cuts out mid-call on a new battery

The IP Multi-Cell draws simultaneously from the audio circuit and the DECT radio transmitter during active calls. That combined load creates brief current spikes the BMS on a storage-voltage cell can read as an undervoltage fault, triggering a cutoff. A new cell shipped at storage voltage — typically around 3.6–3.7V — has not yet completed a conditioning cycle, so the BMS threshold trips more easily. One full charge cycle from the base station resolves this in almost every case.

Base station shows full charge but headset drops off after a few minutes

This happens when the base station reads the cell voltage as charged before the BMS has fully logged the new pack. The base station reports "full" based on voltage alone, but the headset cuts off under real audio and radio load because available capacity is not confirmed yet. Place the headset in the cradle, leave it undisturbed for a complete charge cycle, and do not take it off the base mid-cycle. After that first uninterrupted cycle, the base-station indicator and actual talk time align. If the symptom continues, check that the cell resting voltage off the charger reaches at least 4.1V.