To charge the battery easily!

Portable secondary batteries
Capacity: 4,800 mAh
Lithium-ion
Input: DC 8.4V / 1,000 mA
Maximum allowed by the output current:
* DC 5V / 600 ~ 2,000 mA
Convenience features:
* Battery level indicator
* LED flash
Charging time: about 2-4 hours
Dimensions (W x H x D): 7.2 x 5.3 x 2.3 cm
Weight: 128.5 g