The Gen2 D1x Trail features a cartridge style battery for easy installation and charging.Typical charge time is 2.5h from 9.0vDischarge cutoff voltage is 9.0v. This means that if the battery voltage falls below 9.0v, the battery management chip will cut power to the +/- contacts. Measuring voltage on a voltmeter will show 0.0v until the battery is placed on the charger.Batteries that fall below the cutoff voltage may need to be charged for up to 5h to regain functionality. 350mAh capacity, 11.1v nominal voltage, 3S li-po chemistry