With the popularity of vehicle idle start-stop systems, EFB and AGM start-stop batteries are increasingly widely used. Among them, EFB batteries have gained a larger market share due to their low cost and good high-temperature resistance, and are also facing higher requirements. It is particularly noteworthy that EFB are prone to insufficient charging in actual use, resulting in rapid decay of cycle performance. We selected the EN standard cycle and the cycle under low-voltage charging conditions as the main improvement indicators. Through a series of studies on the selection of positive additives, optimization of negative additives and the matching of electrolyte additives, we improved the problem of insufficient charging caused by electrolyte stratification during use so that battery cycle performance can be improved, and provided benefits for actual use.