The diameter difference of 21700 batteries is relatively large, not as stable as 18650 batteries
21700 diameter, approximately 2 classifications 21.0-21.2mm, 21.5-21.7mm
I have some chonky 21700s that won’t fit in some 21700 lights. The same isn’t true for any other battery size. Just 21700s for some reason
Thanks
I disagree. I have had pleanty of 18650 batteries that wont fit many lights.
IMHO 18650 has far more issues with size.
Are these protected 18650’s and/or re-wraps? Can you measure the diameters with a caliper? Are they all the same brands?