I bought a Kingpin vap battery on Friday, took it home and tried to charge it. Green light comes on but the battery doesn't work. Second time this has happened where I get a defective battery. Do you replace it?

They'll replace it without any worries

I've had no problems with them replacing or it's changing batteries that weren't any good

Yes I've had the same problem..and they replaced mine

Personally, I'd buy a new vape.