I believe this whole thing is getting over complicated. I suggest we go back to the original claim !!
A fresh set of batteries - Time how long they last (no battereenie fitted) - then WHEN the device is accepted as EOL, remove and fit the batteroo. Time how much longer
life is extended.
The claim was - We ONLY use 20% of a battery's capacity, and batteroo will extend it 8X !! All other test procedures are "ours', and even though valid, complicate things.