Battery issue

[Kensterfly]

My iP4 was on the charger all night. It was down to about 20% when I went to bed. This morning it was only showing 96%.
I turned it completely off and left it on the charger another hour. When I came back it was down to 93%. Again, it was totally powered down.

I typically run it down pretty low each night and I always have it on the charger each night, getting 100% when I'm done.

What could be the problem here?

Thanks!

Ken

 

[heartbeat]

It would be best if you let your iPhone do a full charge cycle (letting the battery drop to 20% or less or even completely draining it) at least once a month for max battery usage and that it won't ruin its health fast. It's not a good idea to charge the iPhone every night and day because it will cause the battery to drain faster than usual.