Addressing Battered-Kanga-roo's claims that devices use 20% or less of a cell's capacity. They featured an Apple wireless keyboard as an example device in their slick marketing videos.
At my work they have some Macs, and they use
Energizer Industrial Alkaline AA cells in the wireless keyboards and mice.
So when I noticed one pop up with a message saying "only 6% battery capacity remaining" in the Magic Mouse, I took the cells home and ran discharge tests on both cells at a very low discharge rate (0.05A) down to 0.5V to see how much capacity was really remaining in the cells when they came up with that message. Was there really 80% of their total capacity still remaining? I also discharged a brand new cell of the same make and model to compare the capacity of a new cell discharged at the same constant current rate to 0.5V.
This is an example of the cells:
Here is the discharge curve of a new cell (2477mAh):
And here is the discharge curve of the two cells I took out of the Magic Mouse which showed 6% capacity remaining (393 and 325mAh):
So here is the relative capacity remaining in the cells vs new:
so about 13-15% remaining capacity in the used cells when the mouse still registers as having 6% left usable capacity.
I'd've liked to have used all the usable capacity in the mouse until it turned off and then tested remaining capacity, but someone at work would have thrown the cells away before it got to that point. So I'm breaking with my normal pattern of only using LSD NiMH cells, and I've put some of the same Energizer Industrial Alkaline AA cells in a Magic Mouse at home which I'll use until it turns itself off, then I redo the discharge test on this pair to see how much capacity is really remaining in the cells.
You DON'T need a Batteriser to do this test, and to disprove their claims, because their claims are dependant on how much of a cell's usable capacity is utilized by a device. They claimed initially that "every battery you ever threw away had as much as 80% of the capacity still remaining". This is clearly not the case, as we all knew of course. But the Roopedoopedoovarhar brothers and Co. keep saying that you can't refute their claims without actually having a Battery-iser to test, when that obviously isn't the case.