Being that a governed abrams can do 55mph no problem on flat terrain I was fighting to get to that speed. I upped my battery to a home made 12v 5ah Nimh. Real pain to make fit the way I did and if I had it to do over again I would remove the battery box, split the battery sections in half and put one stick down each side and the ibu in the middle.
Any way, my turret flips around fast and the tank is super fast with a dual rate switch on my transmitter I can drop down to half speed for engagement maneuvers and flip to high speed for crossing our huge field.