The ParaBoard is to be used with a balance charger to charge up to 3 lithium batteries in parallel. The board essentially converts your charger into a dual charger (for lithium packs).
For example, if you have a 6 Amp charger you can charge 3x 2S LiPo packs at a rate of 2 Amps each, all at the same time. The board detects the voltage and capacity and then delegates an even charge rate and current to each pack.
The board has been tested up to 20 Amps continuos use and can even be used at up to 30 Amps for up to 30 minutes.