It can work in powerbank mode and charge multiple devices through usb-cable (not supplied), it is necessary to install a charged battery into the slot number 8 and connect your device. Three charging modes: 0.5A and 1A for eight batteries and 2A for four batteries simultaneously, slots 2,4,6 and 8 will charge your batteries at up to 2A, and the slots 1,3,5 and 7 – up to 1A. The charge current is set by pressing a single button control, simultaneously for all slots. 8 slots that are compatible with different formats Battery: 14500/14650/16340/16650/17650/17670/18350/18490/18500/18650/22650/26500/26650. a maximum of 4 22650, 26500 and 26650.