Jeff,
With the radio facing you, the release latch is between the belt clip 
and the body of the handheld.  Pull the latch toward you (with the 
handheld facing you) and the battery pack will slide away from the belt clip.
You could replace the battery but if it is still charging and 
playing, you probably don't need to be in too big a hurry.
Good luck.
Pat, K9JAUAt 11:25 AM 11/3/2007, you wrote:
>Hi  everyone, I am  having some trouble with removing the  battery from the
>THF6A and replacing it.  It looks like there is a small  bulge on it, and I
>am thinking of just replacing the battery, but if there is anything I can
>do else please let me know.  The battery is charging and working with no
>problem, and I haven't had the chance to use my HT in a few m months, but
>I was thinking of meeting up with someone on a repeater here in  town.