This kit includes 2 18650 button-top lithium ion battery rechargeable up to 500 times. This kit is capable of charging a single battery or two simultaneously. It features a dual input that accepts either a 5V micro-USB or Streamlight traditional AC or 12V DC power sources. Charge time for single bay: 3.5 hours (either bay), or for simultaneous charging 3.5 hours for the left bay, 6.5 hours for the right bay. Includes charging cradle, 2 batteries and USB cord.