Is this ok?

[buddhasummer]

If your charger does not have reverse polarity protection, stop using it and get a better one that does. A lot of the free included chargers are dangerous pieces of crap...

I use these. I'm afraid I have almost zero knowledge about batteries.

 

[Cio]

If it just came off, it is probably a shipping cap to protect it from contacting anything. Battery designs are standardized so it would not make any sense for it to deviate from the standard.

 

[Valeriy Vakshul]

I have some O light 21700 batteries but they will not work with my charger as they have a black collar on positive so the metal head is recessed so battery charger is unable to contact. I've removed the plastic collar. Is this bad for any reason?

Thank you

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Insulating rings on the positive contact for batteries type 21700. Prevent short circuits during welding (soldering) of batteries and when the nickel plates overheat under high loads.

 

[OMyMyOHellYes]

What would happen if I touched the outside ring and center pin with a screw driver. (And no I'm not going to try it to find out, just curious)

That is like crossing the streams! Just don't do it!