so what do i need to order? (bl revo)

[Finnster]

If you want motor braking, you have to lock the tranny (into 2nd gear.) See BrianG's thread in the Revo sec.

Instead of going down on the batt count, why don't you go up on the motor turns, ie a 9xl or 10XL (assuming you could get the 6S A123 to fit)?

You can keep the power, but have a cooler running truck w/ longer runtime.