What is this?
I think some people don't know what this is.
It is a stand alone lipo balancer that you can use while charging your batteries if your charger does not have a balancer. More importantly then that you can balance your lipos while off the charger to ensure that the cells are perfectly in balance.
This is an essential tool in your tool chest because many times after you complete charging the lipos are still out of balance. This is especially true if you are using a cheap charger or cheap lipos.