BlueParrott B250-XT Replacement Battery 3.7V 180mAh

BlueParrott B250-XT / V100 / V150 — 3.7V Li-Polymer Replacement Battery

This 3.7V, 180mAh lithium-polymer battery fits the BlueParrott B250-XT, V100, V150, and V100 Wireless Bluetooth headsets. It restores power to headsets where the original cell has degraded and no longer holds a usable charge. Dimensions are 30.60 × 16.00 × 5.10mm — measure your existing cell before ordering.

• B250-XT, V100, V150, and V100 Wireless compatibility: These four headsets share the same battery bay dimensions and 3.7V single-cell Li-Polymer configuration, so one cell fits all. The connector orientation and BMS handshake requirements are identical across the group.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a B250-XT unit. The BMS accepted the cell without fault flags, and voltage held stable at 3.7V nominal under standard Bluetooth headset load.
• First charge after installation: Li-Polymer cells in small headsets arrive at partial charge from storage. Place the headset on charge immediately after fitting the new cell and run a full charge cycle before use — skipping this step can cause the fuel gauge to read inaccurately from the start.

Why the B250-XT reports low battery sooner than expected after a cell swap

The B250-XT uses a simple voltage-threshold fuel gauge rather than a coulomb counter. When a new cell comes off storage at a lower resting voltage, the headset interprets that as a partially depleted battery and shifts its low-battery trigger point upward. After two or three full charge-discharge cycles, the headset's gauge recalibrates against the actual cell capacity. Voltage at full charge should read 4.2V — if it does not reach that after a full cycle, the charger connection or cable is the next thing to check.

Headset not pairing after battery replacement

Removing a Li-Polymer cell from a DECT or Bluetooth headset cuts power completely, which clears volatile pairing memory on some firmware versions. The B250-XT stores pairing data in non-volatile memory, but a full power interruption can still cause the headset to boot into an unconnected state. Hold the pairing button for six seconds until the LED flashes alternating red and blue, then re-pair from your phone's Bluetooth settings. If the headset does not enter pairing mode, confirm the new cell is seated fully and the connector is latched flat.