I got a 46AX on mine. Here's what I did.

Behind the servo tray is a hold that goes into the fuse.... the bottom is flat. Spread some thin CA to hard the balsa a little and stick on some velcro. Put some velcro on the battery as well. Slide the battery back through the hole and stick it on to the velcro (as far back as possible in that section of the fuse).

If it's still too nose heavy *mine was*, I dipped some weight in epoxy and dropped it WAY back in the fuse... and voila... plane balanced with addition very minimal weight.

Fly's like a champ.