> Presumably the idea is to check "average" current consumption > other than by using a meter that wasn't designed to measure > average current... The original post implied that the units were drawing a constant 3uA. It's emerged now that there's a mix of quiescent and demand currents, which I know from personal experience will result in a completely different battery longevity. Calculations will get you in the ballpark but it's unlikely you'd find a chart for every unique practical application to get an exact answer. To get closer you'd need to know a lot more about the battery's regenerative chemistry -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.