I'm stepping up to the Thunderbolt from the Droid, and I notice the tip from my Droid's charging cord fits the Thunderbolt perfectly - so is it safe to use my Droid's cord and wall adapter to charge the Thunderbolt? Also, I found that my iPod car charger (the cigarette lighter adapter itself) worked perfectly to charge my Droid; should that hold true for the Thunderbolt? I'm guessing that whatever mechanism actually steps down the current is in the phone itself, not in the adapters . . .