>>>> I’ve got a Convoy S5 that is super-picky about cell size. Thanks!
I have the infamous “what-were-they-thinking-making-the battery-tube-so-small” S5, and these batteries fit just fine. However, if you add another layer of shrink tube to protect the original label, they will not fit fine. As someone else mentioned, I too have never seen a 18650 from a major manufacturer that isn’t 18x650. *fire batteries are a different story and come in all kinds of weird sizes.
You will need to put a drop of solder or something on the flattop to make it work with some non-spring lights. Magnets are not recommended because they can move around and short out with catastrophic results.
Gray Panasonic 2900 18650s BRIEFLY start out with a higher output (according to my rudimentary tests), lux wise, as measured with my meter, but they quickly sag maybe 20%, but hold steady after that. The purple Samsungs initially start at a slightly lower lux output, but stay there just as long or longer than the gray Panasonics.
I’m not an HKJ and don’t have any charts to back this up, but I have found that used batteries – even really good used batteries – tend to sag much faster than new batteries, ESPECIALLY with highish amp drivers over 3 amps. These do NOT sag into a quick spiral to low voltages, so I suspect they are indeed new. They also charge up without warming in the least bit, warming being an indicator in my battery farm of substantial use befiore I rescued them from an unexciting life inside a laptop battery pack.