Brought some RM2.5 18650 batteries about 2 weeks ago now, recently noticed a small mark on one of the batteries. Would it be worth replacing these batteries due to that mark?
You're in New Zealand I think?
Those are supposed to be rewrapped Molicell P26A which if true would make them excellent 18650 batteries. I say
"if true" because I found a place in NZ that claims Molicell is supplying them with batteries and the RM2.5 is their P26A. That might be the case, but I don't understand why they would need to be rewrapped. Maybe they're supplying them UNwrapped or something. It would also be risky to publicly claim something like this if it were not true, so it probably is. Unless they are unscrupulous idiots, which is also possible.
Counterfeit batteries are everywhere which is why I'm always skeptical. If you don't know
MOOCH , you should
In fact the site I found uses Mooch's testing for the P26A to sell their RM2.5.
Mooch always says that if a wrap is not 100% intact, it is unsafe. Like my friends are telling you. Get that covered temporarily and get some wraps. There's enough power in these batteries to seriously injure and maybe even kill you if not handled with some simple respect and guidelines.