I'm in the "flashlight nerd" gang, and I've learned to store my long-term storage li-on batteries at near 50% capacity to extend their life tremendously. I've a

I'm in the "flashlight nerd" gang, and I've learned to store my long-term storage li-on batteries at near 50% capacity to extend their life tremendously. I've also implemented this strategy with my portable chargers, and they've lasted for years now at full capacity still.