The F2 Flexible Power Bank is Nitecore's new, dual-slot, outdoor power bank battery charger. This double duty charger can power 18650, RCR123, 26650, 14500, and other IMR/lithium ion batteries using the included micro-USB to USB 3.0 cable or use it with batteries as a power bank to charge cellphones, flashlights, headlamps, and other USB devices on the go. Enjoy up to 2A charging speeds so your batteries and devices can power up quickly. Lightweight and durable, this charger is a fantastic way to always have power at your fingertips - no matter how far you travel. Ideal for backpacking, this is the perfect charger for the rugged nature-lovers out there.