so you mean like testing an alkaline battery to see how much energy is left?
Your description is correct if that is what you want to use it for. DuraCell has good spec sheets for their alkaline batteries on their website. You can use the graphs to estimate the energy left in the battery by measureing the voltage with a specific load on a battery.
So depending on whether you are testing a AAA, AA, D cell.... the load or the voltage curve will be different.
Duracell Alkaline website page:
http://www.duracell.com/oem/primary/...lkcapacity.asp