Don't run the car. Keep the car off and just use the battery.
The cars alternator could fry your electrics. The battery alone should be more than capable of starting your bike.
This. Car battery even in a low state of charge should have plenty of ponies for any bike ever.
Lidl/aldi do reasonable smart chargers capable of the smaller mc batteries for about £12 a few times per year, very handy thing to have!
I would disagree with you, it all depends on the bikes engine size.
My guzzi has a bigger starter motor than my old fiat 999 FIRE engines (and maybe 127)
@BrickMan started
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Don't run the car. Keep the car off and just use the battery.
The cars alternator could fry your electrics. The battery alone should be more than capable of starting your bike.