About this replacement
Logitech ClearChat PC Wireless Headset — 3.7V Li-Polymer Replacement Battery (981-000068)
This 3.7V, 450mAh lithium-polymer cell replaces the internal battery in the Logitech ClearChat PC wireless headset. It fits the 981-000068, 981-000069, and 981-000070 variants, along with three additional ClearChat PC models sharing the same battery bay. When the original cell no longer holds a charge, this is the direct cell replacement to restore full wireless audio function.
- ClearChat PC model coverage: The 981-000068 through 981-000070 variants and related ClearChat PC units share the same 3.7V power rail, physical footprint (31.57 × 28.72 × 5.90mm), and BMS handshake protocol — so one cell fits across the cluster without modification.
- Bench tested on actual hardware: We ran this cell through charge cycles on the ClearChat base station and confirmed the BMS communicates correctly — the base registers the pack, steps through charge stages, and holds the protection thresholds at both ends of the voltage curve.
- First charge in the base station: Dock the headset and let it complete one full charge cycle before your first call. The base station must log the new cell to begin calculating talk-time estimates accurately — skipping this means the charge indicator will be unreliable for the first few uses.
Why the ClearChat PC cuts out mid-call on a new battery
The ClearChat PC draws from the battery on two simultaneous loads: the audio codec and the DECT radio transmitter. Under combined draw, a cell at storage voltage — typically around 3.6V to 3.7V — can sag below the BMS cutoff threshold and drop the headset off the call. This is not a fault in the cell. It happens because the cell has not yet completed its first conditioning cycle and the internal resistance is higher than it will be after three to five full cycles. Run two or three full charge-and-use cycles and the sag will reduce noticeably.
Base station shows charging error after fitting the new cell
If the base station flashes an error or refuses to register a charge after you swap the battery, the BMS handshake has not completed. This usually means the cell voltage came in at or below 3.0V from storage, and the base station's charge controller rejected it as a dead or incompatible pack. Connect the headset, leave it on the dock undisturbed for 20 to 30 minutes — the base will trickle charge the cell back above 3.0V, then step into normal CC/CV charging. If the error clears and charging begins, the pack is fine. If it does not, check that the contacts on the headset and dock are clean and fully seated.