Battery life decision manner and battery life decision device

摘要

PROBLEM TO BE SOLVED: To obtain a method for easily determining life of a battery. SOLUTION: The method comprises a full-charge determining process S11 to determine whether a battery is in the full-charge condition or not, a measuring process S15, S16 to start S12 discharge of the battery when it is in the full-charge condition and to measure a discharge voltage and a discharge current when a constant time has passed from the start of discharge and a range determining process S17 to determine whether the discharge current measured in the measuring process is within the life determining range or not. Moreover, a determining data acquiring means S17 for obtaining life determining data corresponding to a discharge current when the discharge current is determined to be within the life determining range in the range determining process and a battery life determining process S20 for comparing a discharge voltage and life determining data measured in the measuring process and determining the battery life when the discharge voltage is smaller than the life determining data are also comprised.