The Olight 3600mAh 18650 Panasonic batteries are the newest in 18650 battery technology. These batteries are an update to the traditional 18650 from Olight. The PCB is placed in the positive polarity of the battery and can eliminate the electric conduction nickel strap ran through the body. The 3600mAh batteries allow 500 recharge cycles that provides an exceptionally economical solution to battery usage. ?