Thanks for the info, I see the Samsung datasheet says cutoff of 2.5v, but I mostly use only down to 3.7v in a vape.
I guess 1 time test wont hurt them too much.
For what its worth, my laptop batt was replaced so I opened up the old one.
6 x UR18650F sposed to be 2200mah but mine were only...
I got hold of a capacity tester from Mantech, the ZB2L3 and was wondering what I should set the lower voltage cutoff point to?
I see Mooch uses 2.5V as the cutoff, but the auto test function uses 3v as the cutoff.
I would try a fiberglass pen of the type used to clean electrical contacts.
Spin it in a 510 adapter chucked in a drill, slow speed and hold the pen against the sides.