Is it okay to charge the Sprint HTC Hero with a Blackberry charger? They are both listed as using MINI-USB ports but when you look at the actual plug, they look different. The Blackberry charger does fit, and charges, but i was just wondering if anyone had any issues. I went to the sprint store and asked them, but they said that they "heard" it would mess things up. But obviously they just wanted me to buy a car charger from them.