One of the Aussie battery guru's also cam back with this info that I thought would be of interest to other folks here
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The Realeaux monitors each battery individually so it's pretty fool proof in that sense. No real need for matching.
It will charge and discharge according to the weakest battery in the pack, even of the state of charge of each battery is different.
It will charge until any one battery hits 4.2v then stop and discharge until any battery hits about 3v then stop. It's pretty good in that way.
I think the DNA chipped one might even balance the batteries.
Secondly,
at 8 - 12 watts, you would be best off with the NCR18650GAs. You will get through more juice with them than any other battery.
It will only pull something like 1 amp per battery. But if you want the versatility of other mods, then the HG2s would be second best.