Hype batteries for airsoft are Lipo and Lion batteries and they are available at Airsoft Atlanta right now... "New HYPE Battery collection in stock. Li-Po and Li-Ion types in 7.4v and 11.1v.  The new 560mah JST HPA engine battery holds a lot of juice but is still tiny. Great for Polarstar Airsoft and Wolverine Airsoft official builds. Shipping now or visit our Atlanta shop for the best battery prices in Georgia."