It doesn't matter if it's a constant drain or intermittent, the battery's ability to put out a given voltage shouldn't change.
If the battery is capable of putting out 4v under load, it's capable of putting out 4v under load.
You could be right, but I doubt it, until tests are done who knows? I'm entering into this with an open mind. I'm not trying to prove a concept. I just want to find the best battery to use in a Mechanical by using an actual mechanical and simulating real world usage.
It is possible that different batteries have different resistance levels and are capable of pushing out more voltage for a short time than other batteries. For example the Sony is rated to put out 30 Amps burst, the Panasonics are 10 amps continuous and 16 amps burst.
The A & W 1600 is supposed to be so good because it has a lower resistance. There are a lot of questions unanswered.
Let me state why I have my doubts, it's hazy but I put an 18650 MAH batteries into a Flashlight after an hour it couldn't put out enough energy to power the flashlight. I took the battery out for a minute or two. The battery recovered and powered the flashlight for more time.
So we have discharge and we have recovery. This made me think, the Flashlight guys are measuring batteries under constant load with no recovery time. We on the other hand are pushing out huge Amps and Volts for 10 seconds than giving the battery time to recover. It just seems that our usage is totally different.
If I had all the time in the world I should probably be doing 10 Second every 15 minutes!