The neat stuff comes next when you daisy chain another 5S pack in parallel with the "safe parallel adapters" and another discharge wire. In theory, you could charge this setup at the 40 amp maximum rate (20 amps into each battery) with the proper power supply.

So you can see that the potential is there to charge your packs at very high rates, or charge many packs at the same time. Either way, you can save a lot of charging time. To add more packs to charge, you would add another balance adapter to the daisy chain and add another discharge wire. And so on, and so on etc.

Pros:
fast charge
charge many packs at once
up to 40 amp discharge capacity
internal resistance readings

Cons:
need 26V available input to get maximum power from the system
cost to must buy extra daisy chain adapters and discharge leads if you charge many packs in parallel
initial cost of charger
inability to hard wire your 5S packs together