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You can also get one of those cell phone charging batteries and charge it while it is in your pocket. I recommend something like
Need. So I don't get caught with a dead phone on the side of the road. In the dark. All alone.
Want. So I can send postcards to the wonderful people on r/randomactsofcards. And, well, cats!
A giggle for you.
Yeah - very cool idea, though again hard to justify financially next to a battery pack (or a bigger one)