BlueParrott B350-XT Compatible Battery 3.7V 300mAh PL602030

BlueParrott VXI B350-XT — 3.7V Li-Polymer Replacement Battery (PL602030)

This is a 3.7V, 300mAh lithium-polymer cell for the BlueParrott VXI B350-XT wireless Bluetooth headset. It replaces part number PL602030 when the original cell no longer holds a charge. Dimensions are 30.50 × 20.20 × 6.10mm — confirm your existing cell matches before fitting.

• VXI B350-XT platform fit: The B350-XT uses a single-cell Li-Polymer pack at 3.7V nominal. The connector pinout and BMS handshake are specific to this housing — the base station monitors cell voltage through the dock contacts to display charge state accurately.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the B350-XT platform. The BMS accepted the new pack without error, and the base station displayed charge state correctly after the first full charge cycle completed.
• First-cycle base station logging: On first use, seat the headset in the base station and allow a full, uninterrupted charge cycle before making a call. The base logs the new cell during that first cycle — skipping it causes the talk-time estimate to read inaccurately for the first few uses.

Talk time shorter than expected on the first few cycles

A fresh Li-Polymer cell does not deliver full capacity immediately. The B350-XT draws current across two loads simultaneously — the audio amplifier and the Bluetooth radio — so any shortfall in cell capacity shows up quickly during calls. Capacity climbs incrementally over three to five full charge-discharge cycles as the cell conditions. After cycle five, measured capacity at the cell terminals should reach close to the rated 300mAh.

Base station showing full charge but headset cuts off after short use

This happens when the replacement cell arrives at storage voltage — typically around 3.6V — and the base misreads it as already charged. The BMS has not completed a full charge cycle, so the cell is not actually at capacity. Remove the headset, leave the base powered on, reseat the headset, and wait for the charge indicator to cycle through a complete charge sequence from start to full. Once that first full cycle finishes, the cutoff issue resolves.