Double the battery run time of your A20-Mini. With the A20-BatteryDoubler’s two NP-BX1 batteries, expect up to 9 hours battery run time. Easy and quick to fit. Swap the BatteryDoubler back and forth with the standard A20-Mini battery door in seconds.* Super-compact. With the BatteryDoubler fitted, the A20-Mini’s height and width are unchanged. Only its depth is increased. Dual NP-BX1 charging. Both batteries are charged simultaneously when the A20-Mini is connected to a USB-C power source. Water-resistant. With the BatteryDoubler’s door closed, the A20-Mini is resistant to water and sweat. Compatible with the PowerStation-8M charging, file transfer, and timecode station. Charge up to eight A20-Minis or four when fitted with the BatteryDoubler.**   *Already own an A20-Mini? You can have Sound Devices upgrade your A20-Mini’s door hinge to allow you to easily swap back and forth between the A20-BatteryDoubler and the standard battery door. **Already own a PowerStation-8M? You can have Sound Devices upgrade your PowerStation-8M to support the new A20-BatteryDoubler.