I'm in Fl. and the temp is in the 90's. I'm only getting 10'-12' range on my sensor. Is this because of the heat or is my battery going bad? I have read that the RS sensor can be hooked to a 12vdc. Will this improve my range? The close range does make for good pic's. I just got my 1st roll back. I'll have the pics posted in a couple of days.