I disbelieve. How is he going to maintain connectivity while changing the battery? That takes a couple minutes (including the reboot time). He needs a whole spare phone!
(can't tell if serious, but if so, here's the one I bought: Anker PowerCore 13000. Heavy for its size, like all batteries, but nice and compact and powerful.)
Was serious, yes -- thanks for the info. I have a battery charger that can take USB in, but it doesn't have output -- so if I want to switch over to the spare battery I have to physically swap it in. On our trip to Europe it would have been handy a couple times to not have had to do that.
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