ARE-C2 is an advanced multi-charger compatible with broad spectrum of Li-ion and Ni-MH rechargeable cell sizes and capable of charging four different rechargeable batteries simultaneously while the LCD display keeps you informed with readouts of voltage and charging status. Utilizing our exclusive accelerated charging technology, it takes only three and a half hours to fully charge four ARB-L2 (2600mAh) 18650 rechargeable batteries. Fenix ARE-C2 Features -Broad spectrum of Li-ion and Ni-MH rechargeable cell sizes -Automatically select charging modes based on the battery loaded -Accelerated charging -LCD display for battery voltage and charging status -Four slots monitors and charges independently -Advanced safety features Nitecore NL189 Features: Nitecore 18650 3.7V Protected Li-ion rechargeable battery. (2 pack) Protected: Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V. Capacity: 3400mAh Voltage: 3.7V Chemistry: Li-ion Recharge: up to 500 cycles Nitecore NL189 3400mAh 18650 type protected batteries and 2X EdisonBright AA to D battery converter spacers included. These allow use of rechargeable AA batteries in D battery equipment. Supports in-car charging with optional 12V cable.