Downside of this - it doesn't have any options. 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.

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

How to use:
- Unzip and put the file anyware you want (except storage card).
- Create shortcut in \windows\startup.
- Click on LVMTopBat.exe or reboot device to activate.

SOURCE

http://forum.xda-developers.com/viewtopic.php?p=368862

Reviews:

**** [Jun 4, 2007] by vibranze using Asus P525
Good utility. I wonder if the battery bar can be expanded full to the right without additional space left on the right.

***** [May 14, 2007] by redifrogger using Samsung i830
Awesome - simple and accurate.

***** [Mar 21, 2007] by Heman Chow using GigaByte i300
Just what I need. A program that show ONLY battery status. I've tried other similar meters but they all have to show memory status. Doh, It's not like I need to know my PDA¡¯s memory all the time. This program is perfect.

***** [Jan 26, 2007] by Bob Phillips using Audiovox (Sprint) PPC-6700
Excellent. Exactly what I was looking for.

**** [Dec 25, 2006] by ccf using Ipaq 5500
Very nice, very simple!

***** [Dec 13, 2006] by mcl using toshiba e405
Ditto! Sweet and simple and visible from any program.

***** [Nov 13, 2006] by gjs using Ipaq H2200
Love it!! Simple and great.