The Samsung Galaxy S7 Edge has one of the best battery lives of any Android flagship on the market right now. It is, in fact, the first smartphone that I've carried in a long time that doesn't make me panic when I have to rush out of the house for a few hours on less than 40% battery. But this consistency and reliability don't mean that there are no times when I wish I could extend its battery life even more. Maybe for a road trip, a small weekend away, or any occasion where I don't know how long I will have to be away from a wall outlet.

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