Overview:These are a major upgrade for E-flite Ultra Micro, Parkzone Ultra Micro and Kyosho Minium series micro RC models, and fit without modification. With Hyperion's G3 technology, they deliver more capacity per gram than the stock batteries, while sustaining higher voltage under load, for greatly improved power and performance. Of course, like all Hyperion G3 LiPos they last for hundreds of cycles, with consistent performance, when properly charged and stored.