jedirock
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I don't think Li-Ions care too much about their charging current as long as it's in spec, but don't stake your life on that claim.
As I understand it, the selector switch for the current is so that you can charge larger batteries that can take higher current faster, while switching to a lower current for smaller batteries. Your typical Li-Ion batteries can only be charged at 1C. That means for a 2200mAh 18650, it can safely be charged with a current up to 2.2A (2200mA). For a 750mAh 16340 (RCR123), that means it can be safely charged up to 0.75A (750mA). Once you start getting into even smaller batteries, such as 15270 (RCR2), 10440 (AAA), and 14250 (1/2 AA), you need to switch to a lower current, as 650mA will be over 1C for those batteries.
As I understand it, the selector switch for the current is so that you can charge larger batteries that can take higher current faster, while switching to a lower current for smaller batteries. Your typical Li-Ion batteries can only be charged at 1C. That means for a 2200mAh 18650, it can safely be charged with a current up to 2.2A (2200mA). For a 750mAh 16340 (RCR123), that means it can be safely charged up to 0.75A (750mA). Once you start getting into even smaller batteries, such as 15270 (RCR2), 10440 (AAA), and 14250 (1/2 AA), you need to switch to a lower current, as 650mA will be over 1C for those batteries.
