Revolabs Solo Field Compatible Battery 3.7V 200mAh

Revolabs Solo Field / Solo Executive — 3.7V Li-Polymer Replacement Battery (VM9158)

This 3.7V 200mAh Li-Polymer cell replaces the original battery in the Revolabs Solo Field and Solo Executive wireless headsets. It fits the OEM part numbers VM9158 and 07-SOLOMICBATTERY. When the original cell degrades and talk time drops noticeably, this is the direct swap.

• Solo Field and Solo Executive compatibility: Both headsets share the same battery bay dimensions and the same BMS handshake protocol with their respective base stations. The connector orientation and cell profile — 52.00 × 13.96 × 5.76mm — are identical across all listed fit models, including 02-DSKSYS-D and 06-XLRMIC-BLK-11.
• Bench tested on actual hardware: We ran the cell through charge and discharge cycles on a Solo Field unit. The BMS completed the handshake with the base station within the first full charge cycle, and the base showed a correct charge status without error flags.
• First-cycle base station logging: Seat the headset in its base station and run a complete charge before taking a call. DECT headsets must complete one full base-logged cycle before the talk-time counter reads accurately — skipping this step causes the base to underreport remaining charge.

Base station showing charging error after fitting the new cell

A new Li-Polymer cell ships at storage voltage — typically around 3.6V — which sits just below the threshold the Solo base station expects for a recognised, healthy pack. The base can flag this as a fault rather than initiating a charge cycle. Place the headset in the cradle and leave it undisturbed for at least 15 minutes; most bases will then re-attempt the BMS handshake and begin charging normally. If the error persists, remove the headset, wait 30 seconds, and reseat it to trigger a fresh handshake cycle.

Headset cutting out mid-call on a new battery

The Solo headset draws simultaneously from the audio circuit and the DECT radio transmitter. Under that combined load, a cell that has not yet completed its first full conditioning cycle can sag in voltage enough to trip the BMS cutoff — even if the base showed a full charge beforehand. This is not a faulty cell; it resolves over three to five full charge-discharge cycles as the Li-Polymer electrolyte settles. After conditioning, voltage sag under dual load drops and mid-call cutouts stop. Confirm the cell is above 3.7V resting voltage before the next call to rule out a genuinely depleted pack.