I just checked my wildlife surveillance camera that uses 12 AA 2700 Powerex batteries charged in the Powerex MAHA chargers. The camera ran from March 14 until today taking 8115 exposures. There was still 40% charge left in the batteries. They could have easily lasted another month.

HJ, how long did you keep them in your camera? I have used the Powerex for years in speedlights and they have never failed me. I also use 12 AA Powerex 2700s in a wildlife surveillance camera which is unattended for months at a time in sub-freezing weather. I do buy new ones every two years for insurance against failure.

Larry has it right. Powerex 2700 are the best batteries and chargers out there. And that's from experience and research.