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I need an iPad connected to my iMac for a long time, but I don't want power going to it because leaving an iPad charged to 100% all the time ruins the life of the battery(link). I still want to allow data transfer, but with no charge(or extremely little like when it says "Not Charging") going to my device.

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    New Apple products won't overcharge. They'll charge to 100% then drop to 97% or so then back up and will continue repeating this cycle to avoid damaging the battery. Source – Jacob Wood Nov 14 '16 at 4:13
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    Where does it say "leaving an iPad charged to 100% all the time ruins the life of the batter"? – Mark Sep 10 '18 at 17:41
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There is no easy way to do this. You could try to rewire a USB cable with the power wire removed. There's a chance this would work, but I wouldn't bet on it, it would depend on how the iPad handles USB connections.

You won't ruin your battery by having it plugged in at 100%. This might be an issue if you're leaving it 24 hours a day, but Apple is smart enough not to let their batteries die from being plugged in.

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