From the above posted video (and its video series) it becomes apparent that the question
multiple Lipo cell charging in series vs. multiple Lipo cell charging in parallel
is still a major point of discussion on forums among experts and no definite/clear general recommendation can be given. In both cases, though, the foremost prerequisite appears to be that the cells should be as identical as possible incl. voltage/discharge level.
In fact, when we look at laptop cell packs (e.g. 6x Samsung 18650), their 6 cells are connected in a mixed combination (2 in parallel, then in series: 2-2-2) for various technical reasons (stabilization, ..). You could do your maths to calculate the adequate charger settings (Amperage, Voltage) .. but balance chargers (Imax B6, etc.) arent meant to recharge such 2-2-2 sets either, although i am certain that you can do it without problems as long as you connect them properly to your balance board.
But let's be honest, balance charging a 2-2-2 set with an Imax B6 and a balance board is quite challenging! It's more straight-forward to check each cell individually and recharge it one after the other and finally put them back together.
I am well getting now, after having watched the youtube videos (and none of them treat AA, AAA or Eneloops or our round-shaped Li-Ions!!), that those fantastic hobby chargers (iCharger 106B+, iCharger ...) are *absolutely* not meant to recharge our round-shaped Li-Ions.
Not even pre-made battery holders (cradles) for balance charging round-shaped Li-Ions exist (HobbyKing, ..), this says it all. And in the aforementioned case, if you have totally unequally leveled multiple cells (e.g. 15%, 50%, 85%), then it's not recommended to do any balance charge anyway lol (results in a waste of time, etc.).
What the flashaholic rather needs is *individually* controlled battery compartments, i.e. multi-output chargers.
Hobby chargers are single-output chargers (plus balance port) meant to recharge battery packs (which are multi-celled and come with their own balance mini plug).
yeah. again the smart al*ck me. haha