I had to switch to shorty packs in my new 1/10 scale rides and ended up getting 4 of the Nano-tech Ultimate 4600 90C packs. I haven't used them yet...waiting on a few things before I can get out to practice. One nice thing is they give you a set of male 5MM bullet plugs that you can solder to your ESC. The other interesting feature they have is that the female sockets in the batteries themselves go the whole way through the pack, so you can flip the batteries over if you would rather have the + or - on a different side of the car.