Follow along with the video below to see how to install our site as a web app on your home screen.
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Double check ..*#*#4636#*#* <- dial this and you'll get a menu.and check there..If it shows wrong there too , reboot your phone , charge it again 
Background programs can cause this. Try charging after disabling internet (Tap 3G button on power control).
and kill the running apps (unwanted)...
When power is connected , for a considerable long time 

I had experianced it on my A70.
When I keep internet ON, it will never charge 100%. And if I switch off gprs and kill running apps, it charges 100% and I get notification.
This is my experiance only.
Thanks