First things first -- I'm still a little confused on what 2s2p and 2s1p look like. I was good to go on 2s2p, but then 2s1p kinda threw me for a loop. 2s2p is a total of 4 cells in two groups where the two cells in each group are in parallel, and then the two groups are wired in series -- is this correct? If so, is 2s1p a total of 4 cells in two groups where the two cells in each group are connected in series, and then the two groups are in parallel?

Am I getting this right?

So what is the advantage to one over the other? It seems that if each cell was M mah and V voltage, you'd have 2M mah capacity and 2V voltage either way... so what am I missing?

It would seem that a major disadvantage of wiring lipos cells in parallel is the loss of the ability to balance the individual cells in a parallel group. Why would you go with 2s2p ever?

I have a feeling I'm missing something.