I have installed Ubuntu 12.04 LTS on my Acer Aspire-5745. It is not detecting the battery and showing it as not present if I take out the power cable , Still it is working with the same "battery not present status"
Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.
I had a similar issue that occurred after I updated software. I have an Acer Aspire 5742. I rebooted with linux mint on a usb stick and had no issues with the battery. I then went through the log of the most recent updates. One of the updates was for jupiter. I uninstalled it and rebooted. Since then, I have not had any issues.
Not sure if you have jupiter installed, but if so, try uninstalling it and rebooting. Hope that helps.