Runtime, Battery, Flashlight questions

Got my new DMM today. Very interesting. Have been doing some run time tests and now have a little more information and many new things I don't understand.

My KE-1 draws about 2A on High with a fresh cell. The Xtra from Serena is a little closer to 1.9A and the UltraFire Red pulls 2A Both were at 4.05v IIRC. However, in my C1, both cells draw a consistent 1.5A. Why would the Xtar put out lower on the KE-1?

On Mid the KE-1 draws .8A on a fresh cell. (I know this will drop as voltage drops but it is for a reference.) If my math is correct, that works out to 800mA. On a run time test it delivered 3.6 hrs on mid. This works out to 2800 mAh. Pretty good battery i think.

Now in low it draws .08A. Run time tests gave 24.75 hrs for the Xtar and 25hrs for the UltraFire. OK so 80 * 25 is only 2000 mAh. Why would the battery appear to provide less power on low? Shouldn't it be the other way around?

Thanks,

Wade

Are all the batteries charged to 4.20v?

Internal resistance of the battery. Measure is again hold it until the Amps settle's down.