iPhone Backup Battery Pack (1900mAh) - Black

Light-weight, super-slim design to carry with your iPhone or iPod
Conveniently charged via any USB ports
High-capacity, rechargeable lithium-ion battery
LED indicator for battery power level
This item can be used as an emergency battery when you are in vehicle, any situation that you can't charge your Phone.
When you need to charge this backup battery just using Cable connect it to computer or AC charger.