So couple of things. First Cold kills batts really really fast. Second some cams have a setting for lithium or Alk batts make sure that is right if you have the option, 3rd I did side by side comparisions of Duracell, Energizer, and The orange Harbor Frieght brand batts, and the Energizer Ultimate lithium Batteries. For length of duty and overall pic count the lithium batteries won, but not by enough to convince me to pay the difference. What surprised me was the HF batts beat both the Duracell and the Energizer by a substantial margin. I don't have all the numbers in front of me, but I can try to find the spread sheets where I had it all broke down. My process was 4 of the same cams numbered. I ran each cam until all cams were dead. I then rotated cams to a diff type of batts to make sure one cam wasn't using more then another. I did 4 different runs to get each type of batt in each cam. The whole thing took a year and a half.