I bought a pair of Ultrafire 4200mAh 18650 and tested them @1A from 4.2v - 2.75v
I didn't expect them to be anywhere near the clained 4200mAh, but I wasn't expecting this:
Battery 1: 822mAh
Battery 2: 369mAh (three hundred and sixty nine, not a misprint).
Surely these are the worst batteries...
Avoid Ultrafire.
Avoid batteries that look too cheap to be true.
Buy from a seller who can demonstrate the quality e.g. they have tested the actual capacity and internal resistance.
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