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One other thing to be aware of is that sometimes the batteries start to swell. I have a no-SIM iPhone 6 plus that I use as an iTouch. I cracked the screen about a year ago and finally took it in for repair a month ago. It turned out that in addition to the cracked screen, the battery was starting to swell. Apple replaced the battery under warranty. Not saying that is the case for you, but if you notice significant degradation in the battery life going forward, that might be what's going on.
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