Hello all! I was wondering if the markings on the negative side of the battery is safe to use. I was using it on a mech tube and it made those markings. The battery is a Sony VTC5a.
It's one of those where it's probably fine, but probably fine isn't really good enough when you're dealing with something cheap to replace that can explode in your face if the "probably" part of that doesn't work out. I would recommend replacing batteries that have any physical defects.