[Scopedog]

Originally Posted by ShelledPants

www.cheapbatterypacks.com has everything you need to make your own or have them make the battery for you.

+1 on cheapbatterypacks.com
They offer every possible configuration and you also get to choose the brand/capacity of your cells, connector type, and wire gauge. I bought a 9.6V crane stock battery with 4000mAh Elite Sub-C cells for my CA M4 CQB. Fast service, great product. Highly recommended.