Hope these aren’t dumb questions. I’m fairly new to the Li-ion/18650 battery world, though I have lots of experience with batteries in general.
18650 cells are nominally 65 mm long. But there are at least four common types. Is there a standard length for each of these?
flat top no protection____mm
flat top with protection____mm
Button top no protection____mm
Button top with protection____mm
Because the length varies, it seems that there needs to different battery holders for each length. But when I search the Internet for battery holders, very few specify what size (length) the holder fits. Or maybe there’s an adjustable holder that fits all 18650 sizes?
I would like some single-cell holders that fit each length properly. I’d like the holder to be well-designed for high current (15 Amp?). I intend to use these mostly for testing my batteries.