If the battery is old or worn out, that's normal. It takes a dissertation to explain why but in short that's proper for a worn out or bad battery.
I have an Acer Extensa EX4420-5963 laptop with Vista Home Premium.
I have connected the laptop to the electricity in the wall and I can see in the tray bar that the battery icon shows 100% charge but as soon as I unplug the laptop from the wall then it shuts down.
When I plug it again then I starts but it shows me the options to start Windows normally or safe mode.
Any idea how I can solve this issue. All the answers will be appreciated.
Thanks in advance for any advice.