I have an Acer Aspire 7551G that will not power from battery, the AC adapter must be connected for the machine to boot and as soon as the adapter is removed the laptop instantly dies.
The contacts have been cleaned so there should be a good connection between laptop & battery.
Additionally, Windows is aware of the battery, insofar as when it is removed the battery icon changes to a red X to indicate no battery is present and if you reconnect the battery, it switches back. Some times the indicator will show the battery as charging other times it shows as not charging.
Additionally, some battery info tool can get the brand, model etc of the battery as well as current charge level - but even after a good 30 mins of charging the charge level does not charge.
It is almost as if, the power circuit from the battery is broken but data circuit is fine - that's a wild guess, I've got no real idea of how batteries work haha.
It's worth noting that I am only experiencing the issue having replaced the thermal paste on the CPU due to overheating issues. Additionally, I am still seeing these heat issues which strikes me as a little odd...
Hope someone can help me here!