Hope this helps to explain the Power lab 8 and how it would be used for pattern (10S) charging. For this post, I will just speak as if you are charging the usual 5S packs that we use in pattern even though the charger will charge up to 8S packs.

The first different thing is that you can't charge a 10S pack at once (hard wired), but you can charge them as separate 5S packs at the same time. The nice thing with the Power lab is that it supports up to 1344 watts***if ***you have a 26+V power supply or 2 deep cycle batteries in series). With a 13V power supply or a single deep cycle, you will have 1/2 that available (672 watts). The benefit is that you can charge your normal 10S setup at very high rates if your packs support higher than 1C charge rate, OR you can daisy chain up to 9 packs so you could charge 4 sets of 10S flight batteries at once. The time savings when you get ready to go flying can be considerable vs charging 1 or 2 sets of batteries at a time

Setup for a single 5S pack is as shown here:

battery connected to the balance adappter and discharge lead attached - pretty standard set up