just wire up a 2400 cell to it with a toggle switch. Easy!
As for the whole EZ start... a place for the battery pack can be obtained if you use a longer chassis that mounts the engine in the same place. So, you will have a place behind the engine that you can mount your battery pack.
If you don't like that idea, just strap it to the rear bumper mounts like I did.
Enjoy it!
PS: Get a 2400 NiCD - AT LEAST!