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Saw in WashPost that this is a cool site and you love 5s. I have two: one “Genius” tried to change the battery and bent the side opening, so they gave me a new 5s. I kept the old one. Can I replace the battery in both? I use them for travel … is it difficult? Does Ifixit have a repair service? I’m pretty good with tech but not so with hardware. Thank you!

It can be difficult, it depends on your skill. Here’s a guide on how to replace it. How to replace the battery in your iPhone 5s