Most iPhone users watch video or listen to music on iPhone. But the battery life of iPhone can not reach our expectation. So our Geeg find 4 external battery case to extend battery life under most conditions.
Mophie Juice Pack Plus
Mophie is a iPhone backup battery case manufacturer. The Mophie Juice Pack Plus is also a protect case. It build a internal connector to charge iPhone. The only shortage is that the Juice Pack Plus will makes your iPhone heavier as it is still a 2000mAh battery. www.itgeeg.com
As Mophie advertised, this external battery pack can increase 8 hours 3G calling time, or 16 hours 2G calling time, or 7 hours 3G network, or 11 hours Wi-Fi network or 11 hours video watching time.
Mophie Juice Pack Plus is charged by a microUSB port. It can support iPhone4 and iPhone4S. The price is $80. You can get it here.
Boost Case Plus
The Boost Case Plus is very like Mophie Juice Pack Plus. It uses a 2200 mAh battery. As the Boost Case predicted, the Boost Case Plus can support additional 8 hours 3G calling time or 16 hours 2G time, or 12 hours Wi-Fi, or 8 hours 3G network.
It’s also charged by a microUSB port. The price is $79 now. You can get it here.
uNu Power DX-1700B
uNu Power DX-1700B is a 1700 mAh backup battery case. There are no much details about this case. But the uNu says it will increase 10 hour calling time or 250 hours stand by time. It’s also charged with microUSB port. Now selling at a price of $34.95. You can get it here.
EnerG4 Rechargeable Battery Case
EnerG4 Rechargeable Battery Case is also a 1700-mAh backup battery case. It can increase 14 hours calling time or 10 hours time when surfing the Internet. Also charged with microUSB port. Selling at $29.99. You can get it here.