Why my android phone draining while charging?

I Think Theres A App That Drain Your Phone So I Want You To Use Clean Master Or A Task Manager Or Just Hold Your Home Button And Remove Your App Session It Will Close Your App.

Hi there is a fault with the battery or charger so i suggest you start by replacing the charger and see if it makes a difference and if doesn’t replace the battery .

I have this problem also on galaxy tab 4,I. There is 50% left before charging then when I put the charger on it drains to 2%.

While i havent solved this issue with my LG V20 on Android 7, i have gathered some interesting data points. When the condition ocurrs, 2 of the 4 cores are static above 1.0 GHz, while the other 2 fluctuate as they all 4 should be. A battery app shows a very low mA charge rate 100 or even negative rates. After a reboot, all 4 cores are back to dynamic fluctuating. The battery app now shows 600 to 900 mA charging. Also worth mentioning, the play store begins updating apps right after the reboot. So either there was a process out there nailing up 2 cores preventing the play store updates from running or the play store service itself could be suspect. Next steps is now to find a cpu core app that shows what threads and app are running during the event.