Don't buy batteries from a vape shop. You have no way of knowing if they're cheap rewraps or seconded cells that did not pass QC from the actual manufacturers.
It may look cool (the wrap) but you MUST buy directly from reputable sellers and etc.
I'd also suggest (if you don't have one yet you haven't mentioned it) do not use USB charging with external batteries. It puts more strain on the batteries, if you have a two battery mod they may charge unbalanced, and it's just an overall way to decrease your battery life further.
My guess is your battery mostly died because you were pushing it past it's safe tolerance, because it's not likely to be a battery capable of handling the wattage you are using.
The good news about buying direct and making sure they are authentic is that you can genuinely trust that you have what you've purchased, and if you buy the right battery (Baditude should have been of help to you there) you should get safe, longer life out of your batterie(s) and you should be able to vape safely. They're also in all likelihood going to be cheaper than buying from vape shops or elsewhere, and should last around a year, depending on how hard you are using them.
Good manufacturers of chargers include: Nitecore, Xtar, and a few others. If you don't have an external charger, I'd start looking for one and asking questions about that, too.
Battery safety is the single most important part of vaping, honestly. Batteries can vent and go into thermal runaway, causing fire, injury and other things. A regulated mod will protect you to a degree, but simply refusing to fire, but any vape equipment can go into thermal runaway under the right conditions...
Retire the battery and replace it with something safer.
Best of luck,
Anna