They use a 5 cell flat pack i believe?....
As far as spares go, it's a strong buggy so not a lot is needed... maybe some spare steering knuckles, ball-ends and a suspension arm or 2...
If you haven't ordered yet, you'd be much better off saving a few more dollars and getting a hyper 8.5... Handles much better, and parts are more readily available, the hyper 7 is getting old and hard to get parts for! (Hyper 8.5 uses a "hump" pack)