StayCharged is a brand new technology, where the rechargeable batteries have taken the benefits from regular rechargeable batteries and combined them with the best of alkaline batteries. StayCharged batteries have very low self-discharge, the same as normal Alkaline batteries. That is why the batteries in this package are ready for use when taken out of the pack. They are pre-charged and and ready for use even after 1 year in the pack, they are still ready for use! StayCharged batteries can be charged 1000 times. Which is great for the environment and your pocket.