Streamlight rechargeable lights are always ready to go the distance. They're simply place in their chargers at the end of the day so they're fully charged at the start of the next day. Unlike a standard D-Cell flashlight, you can depend on a Streamlight rechargeable to work instantly in even the harstest conditions, and to keep on working for years with the same battery. A Streamlight rechargeable can be charged up to 1000 times, and it packs a lot more power than a D-Cell. Only Streamlight rechargeables come with universal cords that can attach to any Streamlight charger.