I have had three Infuse phones so far and I will be taking this back to Best Buy as well.
Each time the phone has just stopped charging.
I just hope this one lasts long enough for the GS2 to come out.
A little history:
The first time I didn't notice it wasn't charging and the battery died. Every time I would try to plug it in it register the battery like it was going to start charging and never did. These last two times I have caught the phone not charging. If I turn the phone off and then plug in the charger, the phone doesn't show the battery throbber. Instead, it will power on and continue not charging.