I made this battery hold-down today out of 1/16" lexan to hold my Gens Ace 2200 in there.
I think the 2200 is a good size for this - I ran this for a good while this afternoon in the parking lot and put 1930mAh back into the battery.
I love the handling but would like a bit more top speed - so I'm planning to put the cm26-6800 in when my pinions come in for it.