I almost - almost - traded down to my iPhone 4S so I could continue using the incredible iphone battery extender from Seidio. Instead of giving up the lighter, faster iPhone 5, though, I bought a Targus battery pack. It's 4800 mah battery will charge my iPhone 5 twice, or my iPad 2 about 1/2 time. It's about the size of a deck of cards... well worth it. I miss the Seidio case, but I like the versatility of the Targus or JIAYU G3.