You can use 18650s as long as you have the spacer, but the NCR18650B is not a great choice for this light because of the cell’s high internal resistance. They will work, but the light output will drop more quickly than with higher performance cells.
Gnope. If you’re gonna use 2, you’ll need button-tops. You “can” use small Nd magnets to bridge them, but drop the light and they theoretically can shift and short the positive to the (negative) tube.
Plus, they’re great for up to 3A or so, which is fine for smaller lights, but will limit current to the L6.
You can still use 18650s, even without sleeves, but they’ll have a tendency to rattle around when the light’s shaken. Otherwise, a thin sleeve (even cardboard from a cereal box ) can be wrapped around the cells a coupla times to keep them centered and somewhat cushioned.
Simon usually includes a clear flower looking rubbery ring, 2 of them (or 4) that are for putting around an 18650 so they won’t rattle in the 26650 tube. They’re usually inside the tail cap or in the package the light came in.
Didnt get spacers eithers in mine, but i dont get it why would anyone run this light with 18650? i dont see the point in putting those in a big light that throws almost 4000lumens, longer runtimes is better and the batteries sit tight and no need worry about some cheap spacer…