I use lithiums based on battery life alone as I didnt see the up side of buying rechargeables when I have gotten over 14000 pics on one cam and still have 75% battery life. Rechargeables would save money in the distant future but at 30-40k pics per set of lithiums I figured I could buy a set a year per cam. I use eneloops but only in my homebrews now because that does save alot of money in a short time and I think it would be alot longer before you would see a savings using them on a Reconyx. JMO
I too can see that the lithiums last forever. Maybe I'll just stick with that. For me to get 14,000 pics I would have to have used it for 3 years at least....LOL
Sometimes I wish that lithiums could be bought in D cells. I get tired of recharging them.