Here's the photo Mark.....

I still like the isolator. This Boomerang problem is faced every day by the 40% Giant Scalers with their long leads and (10) or more 8411's all going at the same time on large surfaces, and lot's of them swear by it. I have one in a big F-15 that I have. Works flawlessly. You can make up your own leads, or have Andy make any length you want.
Actuall the battery backer is icing on the cake. You can have almost perfect redundacy with two packs and switches thru a Y-connector--I know some guys will claim it can't be done, but Giant Scalers do it all the time. Lots of post on this subject on Giant Scale on RCU and on the Battery and Charger section as well. The backer just balances the current draw-done more evenly between the cells, and protects one pack in case there is a dead-short in the other pack or switch.

Tom