my experience of a knackered battery is that (depending on knacker-age) connecting up to another battery will bring about smooth running, but on disconnecting you'll be back to square one. But at least you know more.
I imagine on the GS the engine management requires a certain level of battery charge, otherwise it fails the entire 'running' process. As opposed to something like an enfield which doesn't have any notable electrics (or brains like the GS) and therefore runs without a battery, on mechanics. Brains need power to do their calculations on how much fuel to dump in, etc, etc.
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