My laptop. Shuts down unexpectedly when on ac power.the battery stops charging and starts to discharge.if i remove the battery while it is still plugged in the laptop shuts down,so i decided to run it on ac alone without battery but while using it it will just shut down just like that.if i turn it on again it might run for a few minutes and then shuts down.sometimes i use it without the battery for a few hours and then it shutd down.its fraustrating.the laptop does not get hot while this happens.sometimes when it is running i insert the battery and it starts to charge till it is full and i use it for hours until suddenly it starts discharging,i then have to shut down the laptop and remove the battery †✽ run it on ac only.other times if i insertg the battery it will charge and stop charging and all of a sudden charge again and stop charging.my laptop trips off when running on ac power only aπϑ then can't run on battery with ac power plugged in.confused.need help.thanks

It caused by your power jack too weak, just replace with a 90Wh Power jack please.

Or you can get some info here : http://www.laptops-battery.co.uk/blog/how-to-charge-your-laptop-battery-properly/#content