to answer all these replies....
i have 3 chargers that have gotten steady use since April.  All 3 are screwy with the indicator lights.  I usually let a battery sit in a charger for 4 hours--or overnight if I am getting for bed.
At work I vape almost constantly, no joke.  I'm surrounded by smokers and pure job stress.  I do go between just biting down on 901 and actual vaping but I do vape a LOT.  I only set it down with my teeth and jaw get sore.
This is second set of batts I've bought from this store--last set lasted about 2 hours also, I'm thinking.  I may try another store & get a couple chargers while I'm at it....
btw, what does it mean when a battery flashes like 50 times in a row (not the normal I'm dying flash of two times)