I also sometimes (less often) have this impression, with a very hot phone in my pocket with quick battery draining.
But this generally only lasts 10 or 15mn …
Not yet found which app or even if any special (some system process ?) is guilty …
Thanks @irrlicht. Of course I keep checking this out every time, but I always get very low % figures from user apps, always consistent with my actual use of them since last full charge.
I recently discovered the “Detailed information” toggle in the menu, and will check it every time then (why on earth is this so complicated to get these so useful battery information details ? to hide stuff in order the user does not get the opportunity to learn things and ask more annoying questions ? pffff … Android is more and more like Windows I fear )