This is the special pack to fit the Lil' Hornet Fun-Fly Park Flier Airplane and the Hornet Helicopter. Make your choice between the two below. The Lil Hornet Airplane pack developed by Radical RC specifically for the Lil' Hornet and is now the defacto standard. Early Lil' Hornets were limited to 7 cells, Kits sold after 01-01-02 generally will accept the 8 cell pack without motor burnout. The Hornet Helicopter also takes a very special shape pack, 7 cells is less popular but listed below, for most, 8 cells is the ticket. Either ship, the pack is designed to fit the battery area to perfection. Manufacturers listed internal resistance of a single cell is 35mohm.