This parallel charging board allows up to 6 of the same size batteries to be charged simultaneously from a single charging port. This is a beautifully designed, well built board with LED indicator showing the number of cells, a 15A replaceable fuse and an assortment of silicone lead balance extensions. It also features resistors between batteries to minimize current inrush on plugin. Please make sure you read up on parallel charging before using this board. The ParaBoard is made of high quality components with a PCB made of two ounce copper.