How many times can the Tanker charge an iPhone 3GS? I've read the Amazon review and it's a bit mixed.
The Hypermac Mini definitely allows pass through charging and as you can get the older model that doesn't support the iPad for $50. Not bad
I don't have an answer for that. It charged my MyTouch 3g 3 times, but I never tried to go beyond that - and I haven't tried it on my iPhone4. Regardless, if you have no need for loose AA batteries t use elsewhere, it would make sense to get that Hypermac for $50.