Logitech H600 981-000341 Replacement Battery 3.7V 180mAh

Logitech H600 981-000341 — 3.7V Li-Polymer Replacement Battery (1110)

This is a 3.7V, 180mAh Li-Polymer cell for the Logitech H600 wireless headset. It fits the 981-000341 variant and slots into the same housing as the original. When the factory cell stops holding a charge, this pack restores the headset to working condition.

• H600 981-000341 fit: The H600 runs a single-cell Li-Polymer pack on a 3.7V rail. The connector pinout and BMS handshake match the 1110 cell spec, so the base station recognises the new pack and communicates charge state correctly.
• Bench tested on actual hardware: We ran the cell through charge and discharge cycles on the H600 platform. The BMS accepted the pack without error flags, and charge state reporting through the base station remained consistent across repeated cycles.
• First-cycle base station protocol: Seat the headset in the base station and let it complete a full uninterrupted charge before using it for calls. The H600 base needs to log the new cell before its talk-time estimate becomes accurate — skipping this step results in misleading charge indicators for the first few uses.

Why the H600 cuts out mid-call even with a charged battery

The H600 draws from the cell for two simultaneous loads — the audio driver and the 2.4GHz wireless radio. During active calls, that combined draw creates short current spikes the degraded original cell can no longer sustain. A worn cell's internal resistance climbs over charge cycles, so voltage sags under load even when the indicated charge level looks healthy. The BMS interprets the voltage dip as a low-battery condition and shuts the headset off. A fresh 180mAh cell with low internal resistance handles the combined draw without hitting the BMS cutoff threshold.

Base station showing a charging error after fitting the new pack

The H600 base uses a BMS handshake to verify the cell before starting a charge cycle — if the new pack arrives at storage voltage (typically around 3.6–3.65V), the base may flag an error instead of charging. Remove the headset from the base, wait ten seconds, then reseat it firmly. If the error persists, check that the headset contacts are clean and making full contact with the cradle pins. A second reseat usually completes the handshake and the charge indicator activates normally.