NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a lightweight nonaqueous electrolyte secondary battery in which degradation of input/output performance is suppressed even when the battery is repeatedly charged and discharged.SOLUTION: The nonaqueous secondary battery comprises a container, an element accommodated in the container and provided with at least a cathode electrode member, an anode electrode member, and a separator, and an electrolyte injected into the container. Assuming that a length between the highest and the lowest positions of the element in a direction perpendicular to the liquid level of the electrolyte while the container is installed in place is L1, and that a length between the liquid level and the lowest position is L2, a percentage calculated by an expression L2/L1×100 is 10% to 100% inclusive.