Windows only: Taskbar status application BatteryBar adds a battery life meter to the Windows taskbar with detailed battery life information and eye candy in a mouseover dialog. Once installed, activating BatteryBar is as simple as right-clicking on the taskbar and choosing Toolbars -> BatteryBar from the menu. The meter button changes from blue to green when you are on battery power, and clicking on the meter button switches the display between actual time remaining or a percentage view. The percentage meter is calculated using a statistical prediction that keeps a history of how quickly your battery usually drains to more accurately predict battery life—so the time remaining may seem a little odd at first.BatteryBar is a free download for Windows only. If you would rather put your battery meter on your desktop, check out previously mentioned Power Meter Plus.