When storing your battery for a week or longer, we recommend charging it no higher than 75%. At 75%, your battery's cells will degrade less compared to a higher charge level.If storing over a couple of months, we recommend checking your battery's charge level once a month and charging it back to 75%, if possible.To assess your battery's life while it's charging, you can check the top of the display screen where it says "ENERGY BAR," or you can check the voltage levels.