Griffin GC23050 Lithium-Ion (Li-Ion) 950mAh rechargeable battery

USB Reserve Power - Compact battery pack that charges from your USB port Sometimes you need to charge when no power outlets are available.
That's why we made USB Reserve Power. Thumb open the retractable plug and slip it into any AC or DC charger, or into the USB port of your computer to charge. Then take it with you whenever you're on the go and no power outlets are available. USB Reserve Power is as versatile as it is portable -- charge your iPod, your smartphone, your GPS, or other 1 amp USB-charged devices . LEDs light up to indicate battery charge at a glance. Works with almost any 1 amp USB device or charger, and is designed to complement the size and shape of the Apple AC charger for iPod.
- Retractable Type A USB plug works with most chargers, including the USB port in your computer
- USB plug retracts — slip it into your bag or backpack and take it with you
- Recharges the internal battery of your USB device when you're on the go
- Long-lived 950 mAh lithium-ion battery
- LED battery status lights.