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Give it some time and see if it changes. Batteries tend to charge quicker when very low and progressively slow the charging rate as they get up to their maximum capacity.

It took 2 hours to go from 95-98% now it's stuck on 98
 
I would turn it off, let it cool down and reboot. After it reboots see if the battery % is the same and plug it back in. This use to happen to my last iPhone and a simple reboot would fix it.
 
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