Kastar 2-Pack NP-BX1 Battery and AC Wall Charger Replacement for Sound Devices A20-Mini, Sound Devices A20-BatteryDoubler

Battery Type: Lithium-Ion; Battery Voltage: 3.7V; Battery Capacity: 1240mAh. This AC wall charger with foldable flat pin for easy storage. The charger Input: AC 100~240V 50~60Hz; Output: DC 4.2V 600mA. LED indicate: Red light for charging; Green light for standby or full-charge.