[Sammus]

Not very well. If you do a 2x2 4s shotgun pack it will nearly fit, but will stick out by a couple mm and youll need some other way of securing them in there (battery doors won't close). Or if you get the extended wheelbase rear arms, you can fit a side by side 6s pack in there which will stick out nearly an inch. (without the long wheelbase rear arms they're too close to the rear tyre).

I can't recall exactly but I think the max battery size is LxHxW = 165mm x 30mm x 51mm