If you post an e-mail adress, I have a set of
battery indicators I can send you. I've edited
them to have green for the first 2 bars of the
indicator, orange for the third, and red for the
last. The "LOW" indicator is all red with white
lettering. They've all been outlined in white,
to stand out against a dark background.

Just to be safe, make a backup copy of the PCF
you're editing.

The PCF is, in reality, a ZIP file. Simply right
click it and select "Open With" and select Winzip,
Winrar, Winace, or whatever compression utility
you use.

Extract the Bitmaps folder, open it, and find
the battery level indicators. There will be 5
of them.

Re-number the replacements to match the originals,
and replace the ones in the Bitmaps folder with
the ones you've just re-numbered.

Delete the Bitmaps folder from the copy of your
PCF you're working with, and add the bitmaps folder
with the new indicators.

Test your PCF with the emulator in PPENG, but
unless you've made a mistake it should work fine.

Important: Make no other changes to the PCF using
PPENG, once you've opened the PCF with Winzip.
Any changes you make that alter the numbering
sequence of the bitmaps, in the bitmaps folder,
will make the altered PCF unusable.