Battery University advises that lithium batteries should be stored with a charge level of around 40 percent. This state of charge is optimal for minimizing age-related capacity loss and maintaining the battery’s overall health. Storing batteries with this partial charge prevents them from dropping to critically low voltage levels, which could otherwise lead to battery degradation or failure.
For LiFePO4 batteries, which are a type of lithium battery, careful attention to both the charge level and environmental conditions is essential. Regular monitoring and maintaining the batteries at approximately 40 percent charge can significantly extend their lifespan and ensure reliable performance.