HME FreeSpeak II Replacement Battery BAT60 3.7V 1800mAh

HME FreeSpeak II Series — 3.7V Li-Polymer Replacement Battery (BAT60)

This 3.7V, 1800mAh Li-Polymer cell replaces the OEM BAT60 pack in HME FreeSpeak II beltpacks, covering the 1.9GHz and 2.4GHz variants. It fits the beltpack housing directly and connects through the same three-pin interface the BMS expects. Capacity is 1800mAh (6.66Wh), matching the original specification.

• FreeSpeak II 1.9GHz and 2.4GHz beltpacks: Both variants run from the same 3.7V cell with the same connector and BMS handshake. The radio band differs, but the power architecture does not — one cell fits both.
• Bench tested on actual hardware: We cycled this cell through the FreeSpeak II beltpack BMS and confirmed the protection circuit completed charge termination cleanly at 4.2V without triggering an overcharge fault.
• First charge in the base station: Seat the beltpack in the HME base station and run a full charge cycle before your first call. The base logs the new cell during this cycle — without it, the talk-time indicator reads from stale data and the estimate will be wrong.

Why the FreeSpeak II beltpack cuts out mid-transmission on a new battery

The FreeSpeak II draws simultaneously from the audio circuit and the DECT radio during active transmission. That combined spike can push current demand high enough to trip the BMS undervoltage protection if the cell hasn't completed its first conditioning cycle. A fresh cell at storage voltage — typically 3.6–3.8V — has lower available current headroom than a fully cycled one. Running two or three full charge and discharge cycles through the base station brings the cell's internal resistance down and stops the BMS from cutting out under radio-plus-audio load.

Base station shows a charging error after fitting the new pack

This happens when the BMS handshake between the beltpack and the base station doesn't complete — the base sees an unrecognised pack state and flags it rather than starting the charge cycle. Remove the beltpack from the base, hold the power button for five seconds to fully discharge any residual capacitor charge in the beltpack, then reseat it. If the error clears but returns after removal, check that the beltpack contacts are clean — oxidation on the three-pin interface interrupts the data line the base uses to confirm cell identity. A clean contact should hold a stable charge start at 4.2V target.