Clear-Com FreeSpeak II Replacement Battery BAT60 3.7V 1800mAh

Clear-Com FreeSpeak II — 3.7V Li-Polymer Replacement Battery (BAT60)

This is a 3.7V, 1800mAh Li-Polymer replacement battery for the Clear-Com FreeSpeak II wireless beltpack headset. It fits directly where the original BAT60 sits and restores wireless operation for broadcast, live events, and professional audio productions. Voltage and cell dimensions match the OEM spec: 59.00 × 42.80 × 16.20 mm.

• FreeSpeak II beltpack compatibility: The FreeSpeak II uses a fixed 3.7V Li-Polymer cell with a BMS that handshakes with the base station during charge. This battery carries the same voltage rail and connector as the BAT60, so the base station accepts it without a configuration change.
• Bench tested on actual hardware: We cycled this cell through the FreeSpeak II base station and confirmed the BMS completed a full charge handshake. The cell held voltage above the DECT radio cutoff threshold under combined audio and RF draw.
• First-cycle base station protocol: Dock the beltpack in the base station and let it complete one full uninterrupted charge before use. The base station logs the new cell during that first cycle — skipping it causes the talk-time estimate to read inaccurately for several days.

Base station not recognising the new pack after swap

The FreeSpeak II base station uses a BMS handshake to register each battery before displaying charge status. A new cell ships at storage voltage — typically 3.6–3.65V — which sits below the threshold the base uses to confirm a valid pack. If the base shows no charge activity or throws a charge error, the cell has not completed that initial handshake. Place the beltpack in the base and leave it undisturbed through one complete charge cycle. The charge indicator should move to full and the base will log the pack correctly from that point forward.

Headset cutting out mid-transmission on a fresh battery

The FreeSpeak II beltpack draws simultaneously from the audio circuit and the DECT radio transmitter. That combined spike can cause voltage sag on a cell that has not completed its first full conditioning cycle. The BMS interprets the sag as a low-cell event and cuts output to protect the cell. Run three to five full charge-discharge cycles through normal use and the cell's internal resistance stabilises — after that the sag under combined draw stays within the BMS's tolerance window and cutouts stop.