Features: There are full charge mode and storage charge mode; Storage charging mode: 60% of the battery is best stored for a long usage . Storing a battery with a full charge is easy to bulge, and storing it without a charge may cause the battery to fail. The storage mode is to charge the battery with the battery power below 60% to 60% for long-term storage. Suitable for Mini 3 Pro 2453mAh standard battery and 3850mAh extended battery can be charged simultaneously; 4 ports for simultaneous charging; Intelligent charging protective chip against overcharge, overcurrent, overvoltage, short-circuit, over load, and overheating; Specifications: Material:ABS Color:Black Charging Temperature: 7-40 degrees Input Voltage: AC110-240V Battery Output :8.5V/2.0A x 4 USB-A Output: 5V/3A Charging: full 4 batteries, 2453mAh about 70 minutes, 3850mAh about 110 minutes; Option Type:European Plug Charger;US Plug Charger; Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Battery Charger 1x Cable