Battery calculating sucks ?

[AhmadSorour]

Hi guys.. I'm facing a stupid serious big problem...that my battery percent changes with a huge difference when I restart my phone !
Before I went asleep I left my phone charging when I woke up it was 100% ... When I restarted the phone ( at the same moment ) it became 48% !!!!
Srsly ?
I hope someone can help
Ty,,,

 

[Rasetech]

I also got this problem today. Another restart solved it. nevertheless a strange bug