I purchased two (2) new Hen Long tanks. Both are S&S, both came with the standard Sender Radio Control. One is for my M4A3 105mm Howitzer and the other for my Panther "G". Removed them from the box, charged the yellow batt. and put the AA's in the controlers. Nothing, no bright light on the controler no sound or start-up for the tank.??? Switched the crystal to another older controller from my M-26 S&S, Tanks work great, no problems. A couple of friends also bought the HL Panther "G" with same controller as what came with mine. Supprise theirs didn't work either. Is it just us or has anyone ealse had this problem??? If so how did you fix it without having to buy new Controllers? Thanks for any help. Chuck R.