Battery dies even while charging

[Curb71]

I was on a call and the battery was low so I plugged it into the wall and continued the call and a few minutes later my phone died. I turned it back on and noticed the battery was as low as it could be. I called her back and a few minutes later it died again. This happened over and over for a few times till I gave up talking.

I also noticed this new icon I have never seen before (see pic 1) which kept popping up. Its the clock like icon at the top right. when I click it it shows this message (see pic 2).

Anyone know why my phone uses more battery making a phone call with the screen off then it receives from being plugged into the wall with the OEM charger? Or if the clock icon is in anyway related to my battery problem?

screen.1.jpg

screen.2.jpg