Make sure your charger is actually charging the battery. Measure the voltage on the battery and confirm it is at least 7.5V or so (the tank will not bind on a low battery for safety reasons). Also make sure you do not have rechargeable batteries in the transmitter. Finally make sure you are turning the tank and transmitter on at the same time. There is only a 2-3 second bind window time the tank is looking for. Sometimes it is best to ask a friend/family member if you are unable to do this action that quickly (I know the bind button on the TX and then hitting the tank switch can be tricky). These are the top 3 issues that prevent a bind. Hopefully this helps!