Possible Duplicate:
Windows battery meter utility suggestions
free software for laptop battery charge indicator for vista ?
Possible Duplicate:
Windows battery meter utility suggestions
free software for laptop battery charge indicator for vista ?
Vista has this one built-in, which shows in the notification area of the task bar:
I appear to be fully charged - it will show a power cord on it if you're running on mains power, and show different levels within the icon as the battery discharges.
Vista has it built in, however I use (and like) BatteryCare