The Mirka intelligent Li-ion battery allows a precise capacity measurement based on a coulomb counter. With Bluetooth and the myMirka® Dashboard, you can easily monitor battery health status and available capacity. It is also possible to monitor individual cell voltage and together with the coulomb counter both battery lifetime and usage time can be prolonged. The firmware in the battery is upgradeable via Bluetooth connection of the sander/polisher. The 10.8V 2.5Ah battery has 6 cells and charging time is approximately 1h 30min.