I used my GPS car charger (with USB out). Stated up to 2Amp output support. Should be plenty. It seemed to work find other than two issues:
Maybe I need to buy the actual incredibly overpriced HTC charger. Ugh!
- With the GPS on and audio out, it couldn't keep up the charge and the phone battery eventually died on a long drive (I've seen several people report this).
- The phone itself complains at times saying that the charger I am using is not an HTC certified or compatible charger and it could damage the phone
Maybe I need to buy the actual incredibly overpriced HTC charger. Ugh!