Downside of this pocket pc freeware is that it doesn't have any options(kind of strange isnt it), the developer do not intend to add any in the future in the name of the current size. Also it receives notifications on battery as they come in, so its very accurate without having to constantly check the battery and generate unnecessary CPU load.

LVMTopBat takes its behavior from the device driver which is why it will act differently on different devices when battery is charging. (Some devices report battery full, others report accurate percentage, yet others "slide" it in a loop).

Also LVMTopBat starts just after MS logo (as you can see from the screen shot LVMTopBat have that space occupied) and doesn't fill the whole screen (14 pixels are left so the units could be evenly sized).