So, if the butteriser just compensates for high peak loads, it won't help in a torch, because that's a fairly continuous resistance load, it won't help in the monkey, because that will run down to nothing anyway.
It won't help in any older hand held games consoles or tv remotes.
It most likely won't do anything in a wireless keyboard or mouse.
It will possibly allow a discman to spin up the disc at a lower cell starting voltage, but won't actually increase the run time.
And it might allow a digital camera to take 5 extra pics...
I'm sold!