How to keep my iphone charged on a 10 hour bus ride?

Going on a field trip from south Fl, to atlanta GA. It's a 10 hour bus ride. We're stopping at rest stops and stuff too ( if you have any ideas with that.) and I'm bringing my iPad. But I need tips to keep my IPhone charged the whole time. Anything will help. Shmanks… <3

Download a battery conservation App to try and prolong the life, they really help! Have a good trip.

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