The battery LED indicator of my Asus X53S keeps blinking (green/orange), even when my laptop is connected to the wall socket. Upon removing the powercord my laptop will immediately turn-off, even on full battery level!
1 - Turn off your laptop PC and remove the battery
2 - Connect to the wall socket.
3 - Restart your PC
4- Turn it off one more time and replace the battery
5 - Reboot your PC
Repeat the operation if needed.
If the above method worked, it means that the battery is intact.
The problem often comes from a power failure (during a storm for example), while the PC is being charged.