Can be charged up to 1500 times and will hold charge up to 1 year in storage. Up to 5 year battery life when used under normal conditions. Extended life composition infused with advanced technology minimizes both self discharge and natural aging effects. Advanced manufacturing process ensures no quality defects leading to a reliable and consistent user experience over an extended time period. Engineered alloy optimizes electrode composition which provides an ideal balance of capacity, cycles, and charge retention. Batteries come pre-charged.