No booing and hissing here!! I would like to clarify, that my changing batteries at 3.6-3.7v range is due to performance dropping off. The only reason I know what voltage they were is merely because my charger tells me when I insert the battery. This is not to say I never run my batteries lower. I have a tendency to run my setups with Nuppin's on top in the 3.2-3.4v range on average... I have been guilty of running a few in the 2.7-2.8v range when out and about and no extra batteries on hand. I think performance wise, it just depends on what atty is setting on the device and have found with the smaller atty's I can go longer on a charge than usual...Noting that there will maybe be a lot of booing/hissing... I ignore the down to 3.7/3.8 that some folks change batts out at. I have always relied on performance to tell me when to change batts, not what voltage they are at. In some of my builds that means I have drained batts almost dry before changing/recharging them with no ill effects.