As far as i know its there in Hemli's wm6 rom.
But you might like this.
http://forum.xda-developers.com/showthread.php?t=289003
It looks like the stock battery meter but it is allot more accurate.
The file does overwrite a file on the ppc thats holds other images for example the recent call arrows. But i have a custom dll of this program i made that keep all the original dll data and this new one. Basically merged both dlls together.