Originally posted by bertwert I found a set of four 2300mA Ni-MH batteries at home and stuck them in a charger.
I'll do a test between those and the D-Li109 soon and report whichever lasts longer.
What would be the best way to test which lasts longer?
Put camera in LV with no auto power off and see how long before it turns off?
Theoretically, and assuming that all parts are functioning fully at maximum spec, you are testing a battery of four 2300mAh 1.2V(max) batteries against one 2100mAh 8.4v(max) battery.
On paper, the 2300mAh battery should win. In a test such as you suggest, the 2300mAh battery should win.
Neither, however, is real world testing and actual battery usage is not as simple as drain under constant load.
The best test would be to use your camera as you normally do and to see which pack gives you more shots.
And yes, this includes down time when you might not shoot for a day or two.
If you just want to know whether the four AA batteries are rated for more mAh than a D-Li109, then yes, they are.