I'm not going to argue with the physics of it, but try it, you'll see what I mean.

of course a cold battery looses 'ummpf' faster than a warm one, and you have other issues around the condition of the terminal connection.

Car starters will have a much more powerfull battery and constant compression (being an inline 4) per turn, whereas the singles need to turn the engine through a high compression and low compression cycle. I don;t know the reason, I'm just throwing in some suggestions

Also, on a bike that isn't run everyday, the battery will loos charge as it stand anyway, and the less it is used the more it seams to loose charge.

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