BlueParrot Vxi B350-XT Compatible Battery 3.7V 180mAh

BlueParrot Vxi B350-XT / B250-XT+ / V100 Wireless — 3.7V Li-Polymer Replacement Battery

This is a 3.7V, 180mAh (0.67Wh) Li-Polymer battery for the Vxi BlueParrot B350-XT, B250-XT+, V100 Wireless, and B250-XT wireless headsets. It restores power to the headset's audio and Bluetooth connectivity when the original cell has degraded. The battery measures 30.60 × 16.00 × 5.10mm — physical fit matters on compact headset cells, so confirm dimensions before ordering.

• B350-XT / B250-XT+ / V100 platform compatibility: These models share a common internal cell footprint and 3.7V supply rail. The connector pinout and BMS communication are consistent across the group, which is why a single cell covers all five variants listed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the B350-XT platform. The BMS accepted the new cell without error, held charge to the rated 3.7V nominal, and showed no thermal anomalies during the charge phase.
• First charge after installation: Li-Polymer cells in compact headsets ship in a partial state of charge. After fitting this battery, charge the headset fully before first use — the cell needs one complete cycle to allow the BMS to calibrate its state-of-charge tracking accurately.

Talk time shorter than expected after battery swap

A freshly installed Li-Polymer cell at 180mAh may underperform on the first one or two cycles. The BMS has no charge history on the new cell and may cut off early while it calibrates its discharge curve. Run two or three full charge-to-cutoff cycles and the BMS will track the cell's actual capacity correctly. If short duration persists beyond three cycles, check that the headset is not stuck in a high-transmit mode, which increases draw significantly above idle.

Headset not pairing after battery replacement

Removing the battery from the B350-XT cuts all power to the headset's memory, which can clear the stored pairing data. The headset may power on normally but fail to reconnect to the previously paired device. To fix this, manually re-enter pairing mode on the headset — hold the power button until the LED alternates — then re-pair from the Bluetooth menu of the source device. No reset of the source device is needed; the headset initiates the pairing sequence.