About this replacement
Sony MW600 / MH100 — 3.7V Li-Polymer Replacement Battery (GP0836L17)
This is a 3.7V, 250mAh Li-Polymer cell that replaces the original GP0836L17 battery in the Sony MW600 and MH100 Bluetooth neckband headsets. It restores power to the audio and call functions that depend on this cell. Voltage and capacity match the OEM specification exactly.
- MW600 and MH100 compatibility: Both models run the same 3.7V battery rail with the same physical footprint and connector orientation. The GP0836L17 cell fits either headset without modification to the housing or cable routing.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the MW600 platform. The BMS accepted the new cell without fault flags, and the headset returned to normal operation across audio playback and call handling.
- First-cycle logging on the MW600: Charge the headset fully via its USB connection before taking a call. The MW600 reads the cell state during the first charge cycle, and an incomplete first charge can cause the battery indicator to report inaccurate levels until a full cycle is completed.
Why the MW600 cuts out mid-call on a new battery
The MW600 drives two simultaneous loads during a call — the Bluetooth radio and the audio codec. Together, these pull more current than audio playback alone. If the new cell has not completed a full charge cycle, its available voltage window is narrower than rated. The BMS interprets the resulting sag as a low-cell condition and cuts power to protect the cell. A full charge before the first call resolves this.
Headset shows full charge but shuts off after a few minutes of use
This happens when a replacement cell ships at storage voltage — typically around 3.6V — rather than a full 4.2V charge. The battery indicator reads that initial voltage as "full" because it hasn't yet calibrated to the new cell's actual range. Under load, the cell voltage drops quickly and the BMS triggers a cutoff. Run one complete charge from flat to full via USB, and the voltage reporting and cutoff behaviour will normalise.