What happens to iPhone if USB cord wasn't fully plugged into phone?

I often leave my iphone to charge overnight but recently I woke up and the phone said it was charging but it was at 10%. On further inspection, I saw that the USB cord was like half way into the power adapter.
Is this damaging to the battery? I'm worried that my new 5S is damaged because the battery seems to drain about 10% faster.

No. It just has an incomplete circuit.

Turn the phone off and on again. Then let the battery drain dead and charge it back to 100%.

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