ZEN+: ULTIMATE COMPATIBILITY. 26,800 mAh capacity. The A-Series battery will automatically turn itself on when connected to a compatible device for charging. The A-Series battery can maintain up to 95% of its charge after six months without use. The unique charge-through function allows you to charge the external battery while it is charging your devices,. The dedicated QC 3.0 Port can output 5-6V/3.0A,6-9V/2.0A,9-12V/1.5A (18W Max).