Battery Pack for iPhone 3G

[benchlegs]

Been looking for a battery pack to extend the life of my 3G.
Anyone have any recommendations?
Thanks in advance.

 

[quadchick10]

3G Juice. I own two and they came in very handy while I was at the airport. You can find them on Amazon.com.

 

[maliu]

I use an external battery pack from New Trent. I have two different ones. I have a need to be able to charge multiple devices. The IMP 50 has both a 1 amp as well as a 500 ma port and will charge an iPad 50% as well for under $50. The IMP 500 will charge my phone several times. I use it mostly to charge my Verizon MIFI as the battery life on that is short. The IMP 500 is closer to $40. Shipping is free!