Anything that charges in pairs or multiples you really should avoid, thats not a good way to charge. If used for an emergency then they are ok to use but don't use ones like that for normal charging.
You mean because each cell should be charged individually versus in series or parallel? How it charges the batteries depends on the design of their charging circuit. It's impossible to know without looking at it, but the descriptions of the device I've read imply that there is some intelligent charging going on.
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