My only other thought has to why i am getting 2 hrs is, after the first initial charge i let them stand for a week or so without use, i think i may have then recharged them prior to there first use. Just wondering if these are the types of batteries with memory and whether that has affected their burn life? Anyway, i'll charge this new set that i have received now prior to using, then run them down to check burn time, then charge them again. At least i've also got a spare set with a 2 hr burn time as well. Thanks.