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 charging output, your charging effort is reduced, especially when dealing with multiple batteries. There is no need to unplug and replug when a battery is charged, and your batteries will be charged cleanly and balanced.