Lead-Acid Battery System And Lead-Acid Battery Life Estimation Method

Described are a lead-acid battery system and a lead-acid battery life estimation method capable of accurately estimating a remaining life of a lead-acid battery by calculating a capacity turnover value during operation in consideration of a magnitude of a depth of discharge (DOD). The lead-acid battery system estimates the remaining life by comparing a capacity turnover value from the beginning to the end of life with the capacity turnover value during operation. The lead-acid battery system includes a capacity turnover value calculation unit that calculates the capacity turnover value during operation. The capacity turnover value calculation unit calculates the capacity turnover value during operation using a DOD-based correction coefficient calculated based on the DOD, which is calculated by dividing an integrated discharge capacity after the start of the discharge of the lead-acid battery by a rated capacity of the lead-acid battery.