It seems to be where the connector goes into the back of the laptop
if this was faulty then the laptop would not power off he mains.
Laptop Battery not showing Charging
1. Turn off the computer,
2. Take the battery out
3. Take out the power supply
4. Push the power button down for 30 seconds.
5. Reconnect power supply
6. Then the battery.
Should now show 100% charged. This is because sometimes the mother board gets static and this clears it and the reason it showed not charging was beacuse it was fully charged.