Can a large 21.7mm diameter 21700 battery fit into most 21700 flashlights?

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.

:scream_cat:

Are these protected 18650’s and/or re-wraps? Can you measure the diameters with a caliper? Are they all the same brands?