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My battery level always shows up as something like 55% remaining or 63% remaining ...etc despite that it is in fact charging. Additionally it doesn't go any further than 80% remaining even if I keep it in charge forever.

This leads me to a side annoying effect which is that I cannot proceed to install Windows 7 Service Pack 1 as its installer requires the laptop to be plugged with a power cord. My laptop is plugged with the power cord but because of the above issue (it doesn't display anything else than the xx% remaining) Windows thinks that the laptop is using its battery and that the power cord is disconnected.

I have installed the original acer ePower Management tool that let you configure the power scheme... etc, I was hoping that this would help me circumvent the 80% issue but it doesn't.

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up vote 1 down vote accepted

The fact that the battery does not charge over 80% points to a faulty or old battery.

To work around this in order to install the service pack, have you tried to start the laptop without the battery, only connected to the PSU?

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Well, I JUST purchased that battery, it is completely new but it is not an original one from acer. Why 80% though, and always 80%... – mks-d Jun 5 '12 at 8:27
If it is not an original, it may be somehow incompatible with the laptop or damaged. If it is new and only goes up to 80%, I suggest you to return it to the vendor and get an original acer battery. – Michael K Jun 5 '12 at 8:29
Not really an immediate option given that I bought it in another country but I guess you must be right as this is a no-brand copy of the original acer battery. It works though and I have about 2h of battery life from the 80% mark. – mks-d Jun 5 '12 at 9:46

Please refer to this link. I had set it for Sony Vaio and forgotten. This guided me to the right answer.

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Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – slhck Dec 15 '12 at 8:07

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