How long will the battery 24-Volt stay charged if not used? 365 days battery life Related articles Is the battery fully charged? Will I Damage my batteries if I leave it charging after it is fully charged? How do I check the battery charge level? Shop Joe Detergent and Usage What is the best measurement of a lithium-ion battery pack’s performance? How does the Snow Joe + Sun Joe EcoSharp 40 V 4.0 Ah lithium-ion battery pack (model iBAT40-LT & iBAT40-LTE) compare to other lithium-ion battery packs in the market?