Battery Draining

[mkm1g15]

I have 3 devices with dominations on them. I use my high end one plus 5t for war attacks and the remaining, aren't bad either. One is a moto g5s and the other is an old HTC one. Since the recent update the charge falls on all three of them even while I'm charging and playing.
It's never happened below, and I would just like to know if it's happening to any of you out there.

Cheers,
Malcolm-Rogue Knights