I know this section is dead now, but those of you that look at this section for Z car stuff, I found out something neat.
If you own a Zip Zaps Monster Truck with the same frequency as your Zcar, and your Z car has problems with battery life, range... You can put the Z car on the ZZMT controller/charger's prongues, hold it there and manually charge it for 45 seconds and then run it around with the ZZMT controller, and you might see a difference. I did with my Z car and have determined the controller that came with my Zcar is broken in the antenna.

. So if you break your Zcar controller and you own a first edition or monster truck Zip zaps controller with the same frequency then your in luck!