yup, with that big of a motor up front you will need a smaller battery. i usually fly the scouts w/ a 1806 and 850mah and it balances perfect. you may find if you do a complete build that you need to add a little weight to the tail. just make sure if you do you go as far back and as small as needed to balance.
good luck, the scout is an excellent first foam build and flyer. i have taught more people to build and fly with it than i can count at this point.
laters,
me