I have a Sony vtc5 that won't charge. It was charged and working fine. It wasn't hot, did not vent, it just stopped working. Any reason this would happen? It's not my rda or mod because I put my other vtc5 in the mod and it fired just fine.
It's either the battery or the charger.
Battery; If you discharged it to less than 2.5V some chargers will not re-charge it. If you discharged it too low you have damaged it. How much depends on a lot of factors, but the battery could be dangerous now and there is no way you'll know if it is until it vents or starts a fire. What is the battery voltage now?
The vast majority of VTC5's that have been sold since about late last year are counterfeits. They should not just stop working, but if they are from a really questionable supplier, they could be really sub-par. When did you buy this one and from what supplier?
Charger; Does it charge other batteries? What charger is it?