Could anyone reccomend a battery pack for me to run in my MX-3X?
Am currently using AA's, but wanting to upgrade to a life/lipo/nimh pack to save the hassle of keeping AA's on hand.

Its this one here if it helps:
http://www.amainhobbies.com/product_...92744-Receiver

http://www.amainhobbies.com/product_info.php/cPath/1389_1393_127/products_id/15789/n/ProTek-R-C-Li-Poly-Flat-Receiver-Battery-Pack-74V-2300mAh-w-Balancer-Plug"]http://www.amainhobbies.com/product_...-Balancer-Plug[/URL]
This is the one I'm using in mine

Thanks.

Do you need a regulator with that as well, or does it handle the 2s fine?

handles it fine. In the owners manual says ok to run 2s.