Napsal jsem na zákaznickou podporu firmy Olight:

I have a new Olight S2R Baton II Cu version. It is a really nice flashlight and I like it.

But I have a problem with battery compatibility. Of course, it works and charges with your battery. But if I install another 18650 it does not work. I am aware that it would charge only your batteries, but I expected that it would work with any 18650. It seems that the + pole of standard 18650 batteries does not reach the contact in the flashlight.

Please see attached photo. The violet (Samsung) or red batteries with flat tops does not work. However the black battery (Soshine, despite it is only 3,2 V) works because it had "button" + pole (instead of common flat top).

Is it feature or defect? Should Olight S2R work with any 18650 or only with certain ones?