I had been getting frustrated with my 901 vaping experience for the past 3 weeks or so and thought I had gotten a batch of used batteries or used attys. I kept switching this battery with that atty and visa versa. Put several of each in the "Bad" parts baggie and got mad. Then it dawned on me the only thing I hadn't changed out was my charger. I had a new one in my stash so I put it into service. Well, I guess you know where this story is going- yep! First battery off the charger (one I thought was crap) is hitting like crazy! Guess I will dig through my baggie and see what happens with the others I thought were goners. So, when all else fails- get out your spare charger! 