Swaytronic Paraboard. Application: The simplest and safest solution for charging multiple batteries simultaneously. The Paraboards allow you to charge up to 6 or 8 batteries with the same voltage through a single charging output. The configuration of the Paraboard ensures that the batteries are charged in a well-balanced manner. Batteries with different states of charge (SOC) can be connected. Customer benefit: By charging up to 6 or 8 batteries through one output, your charging effort is reduced, especially when dealing with multiple batteries. There is no need to unplug and replug the battery once it is charged, and your batteries will be charged cleanly and evenly.