Originally Posted by Hawk
As long as it is MADE specifically to work with the 3G or 3Gs, then it will stop charging when 100% is reached. If not, then it could be a crap shoot and you could over-charge your battery.
I would contact the manufacturer and verify with them. If you can get something in email, then if your phone does burn up, you at least have something to hold them accountable with so you can get a new phone.
Hawk, shouldn't you be able to tell if it's not overcharging by the battery icon image in the upper right corner? It should go from the lightning bolt image to the plug image when it's done charging. My thinking is that if it stays on the lightning bolt indefinitely, it is overcharging and if it changes to the plug symbol, within an hour or so, it's not overcharging. Correct me if I'm wrong, k?