I just had to hard reset my MyTouch 4g because it was burning through the battery while sitting idle on my nightstand. In bed at 1am with a full charge I was waking at 6am with 25% power remaining...at the most. I hope the full reset alieviated the problem but it would definitely be nice to pick up an external charger like this. Plus, it is small enough to leave in my fiance's purse and have her carry it!