I have the same issue and I, too, don't have comfort access. Therefore, my batteries charge with driving and should both be charged by now. Range is awful...20-30 feet max.
I, too, had my windows tinted but I'm having a hard time buying into the claim of tint messing with it since I most often approach the car facing the antenna (or so I assume I am), and the range was never stellar prior to the tint. With the tint being on the inside of the window (i.e. antenna more outboard of the layers) I don't know why/how tint is a factor.