So, I got my batteries and cartridges from Blu today. They were free due to an issue that I had with one of their retailers, however they didnt come with a charger. So, I bought 2 little usb chargers from discount vapers for pretty cheap. Did alot of reading and what not and more often than not it says the chargers that I got are compatible with the blu batteries. When I first got them in, I took the charger, plugged it into my computer with the battery attached, and it worked. About 5 minutes later, i started smelling this burnt smell, and the charger was really hot. The battery still works, and the charger too. I also smelt the other one that came with it, it smells the same as the one that i plugged into the computer. So I was wondering, could this be because they are brand new? Im really nervous about trying it again, dont want something to go terribly wrong. Im not too concerned about the blus to go spend 13 on one of their chargers, considering the fact what I got was free, and they are used as a backup to my backups. Any suggestions?