Buzzing battery

I run a Sigelei V2 with paired 18350 batteries. I have a single Sigelei charger that I have to, obviously, charge one at a time. Recently one battery in particular has started to make a slight hum or buzzing sound in the charger. That’s never happened with any of these before. I took it out right away and haven’t fully charged it, I want to know if it may possibly blow up soon or something.

Or it could just be a sign that I need to go ahead and get a handful of 18650s instead.


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