Best safest / safest way to make a battery ?

I need 5 and 6v so 3s2p + step downs seems like it should be the most efficient.

I know I need a BMS for the series part but what kind of protection do I need to make sure the parallel parts don’t discharge in each other ? Is it easy ? Should I just eat the efficiency loss + cost and go 6s ?

submitted by /u/JustFinishedBSG
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