How to store/ conserve unused Li-ion/ Li-po batteries?
Have several unused Li-ion and Li-po cells: My laptop battery, only used when working outdoors (is in summer). Half broken MP3 players, phones, a broken RC helicopter and some larger batteries. Some might be useful one day in a future project. As I understand these cells slowly deteriorate even when not in use. What is the best way to keep them in shape? Perhaps dry storage in a freezer? Charge them occasionally or have them uncharged? Are button cells Li-ion cells?