Well i'll take the task up of emailing them, and see what they come back with, its a far far cheaper option, and the MAh is higher with the same voltage.I could be wrong here fellas but you can buy this sort of thing in the UK.
When it comes to battery technology the RC model world is years ahead of the paintball world.
These guys build battery packs for us at really good rates.
http://www.component-shop.co.uk/html/small_packs.html
Just drop them an email.
DM