Apart from Lithium Ion Batteries, Vengeance also make Lipoly Batteries and two of these are in stock right now at Airsoft Atlanta... "New Vengeance Li-Po stick batteries!. $15.99 for 7.4v and $21.99 for 11.1v. a few hundred in stock at our local Atlanta shop. The 7.4v is great as it fits in everything! Stop by and check them out this weekend."