I forgot my Desire HD charger at home and will be away for a couple of days. The only thing I managed to buy for now was a charger at a fuel stop to tide me through. I tried charging the phone before buying it and although it's a little tight to push in and out, it charges fine. Here are the specs on the charger - AC 100-240V/50-60Hz/180mA, Output: DC 5.0v/890mA. Will this be fine as an emergency charger? Or am I damaging my phone? Thanks.