The Lithium-Ion Battery Cells used in the Foil Drive systems feature thehighest energy density available while maximising the power output, runtime and performance of the system. This means we really are packingas much as we can into such a small space! Each of our Assist Kits are compatible with their own Foil Drive batteriesthat offer different benefits for different use cases, runtime, power,weight and compatability are all key variables.