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Are you hoping to swap the cells on the go or build one up semi-permanently?
I like the TOMO ones because they have a separate circuit per cell so you can swap full and empty cells without bad things happening, and they also won't catch fire if you insert a cell the wrong way round like the ones that put all cells in parallel.
grams
aggi
Are those USB battery chargers that can also be used as a powerbank much of a muchness or is there anything to avoid/go for? I've already got 18650 batteries to use.