if i get two of themYou could use 9v's but they have a low Mah... You want a very high one...
If i was you go with the links i put up earlier and you wont regret it
http://www.7dayshop.com/catalog/product_info.php?manufacturers_id=&products_id=8137
that adds to 340 or doesnt it work like that.
am not good with batteries hence why i asked lol