I have so many wall chargers laying around, 1 for my phone, 1 for my Mp3 player, yada yada. They all have the same USB plug in so I generally use the same wall charger with the device specific USB for charging. Can I safely plug my EVOD USB into one of these for charging? The only difference I've seen in the EVOD wall charger is the little green light when it's plugged in. I just don't wanna screw anything up!