The battery monitor icon on the Gnome panel in the lower right corner. It is always showing that it is plugged even when its not. I have no way of knowing how long the battery will last. It was working but has stopped, since I got it back from acer (they replaced the monitor) I have reinstalled Linux Mint 4.0 and still have the problem. Not sure what to do.
Called Acer tonight looks like issue is with the the hardware and not a Linux Mint issue. I'm sending it back for repairs again. Its frustrating but Acer customer serves has been very helpful and has not made an issues in that I'm not running the default OS (vista).
Thanks, Sorry for the confusion...