would a 3s helicopter lipo fit into a original hpi sprint?

[scarletboa]

that question you are asking is kind of vague. there are a wide variety of sizes of lipos and it all depends on the physical size of the battery and the capacity.

a nice 3000-3600mah 3s lipo from hobbyking would fit very nicely in the sprint as they are a little smaller than a 6 cell ni-cd stick pack.