With the popularity of vehicle idle start-stop systems, EFB and AGM start-stop batteries are increasingly used. Among them, EFB batteries have gained a larger market share due to their low cost and good high-temperature resistance, but are now facing higher requirements. It is particularly noteworthy that EFBs are prone to undercharging in actual use, resulting in rapid decay of cycle performance. We selected the EN 50342 standard cycling testing and cycling under low-voltage charging conditions as the main improvement indicators. Through a series of studies on the selection of positive additives, optimisation of negative additives and the optimisation of electrolyte additives, Jinkeli has improved insufficient charging caused by electrolyte stratification. Negating stratification has improved battery cycling performance under the prescribed testing.