Please be very careful about purchasing 18650 batteries. ?I looked at the link and there is no such thing as an 18650 that is 9900maha. ?
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There 18650 battery has a nominal length that varies on the type of top on the battery and if it is protected.
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This is a pretty good reference:
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These batteries need care. ?They are designed to be built into systems not used stand alone even though!!
Robert Fairbairn