BattCursor shows the battery charge in percent directly under the mouse cursor not only this it offers many other battery-saving features like dim down the display brightness for inactivity, automatically disable the Windows Sidebar and Aero Glass when battery level goes down beyond a specific level.
The best feature of this free battery monitoring application is it always displays the remaining battery percentage under the mouse cursor which is seen all the time to the user, this could be really useful when you working on some thing important and your laptop is running out of low battery.