ON THE WAY&reg;18650 Charger and Battery Set Come with 4X 18650 4000mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery and 1X Dual Charger 18650 Ideal for LED Flashlights and Headlamps ON THE WAYLithium Ion 18650 cylindrical rechargeable batteries with charger Great option for todays high end electronics like LED flashlights, torches, headlamps, search light lamp etc. Feature a patented Internal PCB protection against under voltage and over voltage No memory effect: can be recharged and discharged anytime Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V