A contactwire-less railcar driven by an Mn type lithium ion battery was developed and the energy-saving effects were examined. The relations between running time and voltage, current, and integrating watt were investigated in detail in a running test conducted on the flat Mikuni and sloping Katsuyama lines of the Echizen railway. The railcar ran when the lithium ion battery module was discharged between 660 V and 490 V. On one charge, the railcar could run for more than 20 km. The running performance of the contactwire-less railcar was comparable to that of the contactwire railcar.