Alexander Pruss has released an application which allows you to have a battery symbol (instead of the exclamation mark) in the status bar on Palm devices (T3/T5/LifeDrive/TX). Though it is still in development it is still relatively stable. The whole 1SRC thread can be
found here: http://www.1src.com/forums/showthread.php?t=123160
You can download the software here: http://www.1src.com/freeware/fileinfo.php?id=1650 (for those without an 1SRC account I’ll upload the files here [actually: v.1.0] - it *should* be the most recent version. If not, please leave a comment)
On my Palm TX the app redesigns the status bar like that:

it also updates the symbol when plugged into cradle:

A great app for those who always want to know the battery status of their palm.

Ah, I forgot to mention: it’s free!