Caught red-handed (lol)

I was charging, and when I opened the charge screen, it said completion in 1 minute. I kept it open and checked, but it didn't complete even after 3 minutes... I couldn't wait, so I unplugged and replugged it, and watched again, and it finished. (Charged to 52%) If I have to unplug and replug when it stops, I can't do this while sleeping at night...