A battery level, original or not, no man can tell.

A battery level, original or not, no man can tell.
My S3 Mini has received a one hour flight. Then came sporadically following phenomenon - sudden battery from 90% to 5%.
Phone automatically restarts itself - after restart only 2% battery etc etc.
The old battery did not survive the flight hour.
The new battery works great and the mobile phone is to use again.