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Various estimation methods for the residual capacity of the the sealed lead-acid battery have been proposed. However, no method can accurately predict the residual capacity. It is known that the internal resistance and the electromotive force are related to the residual capacity. An equation for estimating the residual capacity of the sealed lead-acid battery is proposed. The experiments were performed for verification of the proposal estimation.
Yanagihara et al. (2002) studied this question.