11-02-17, 11:24 PM
If it's say an Optimate 3 without a car function mode then it will be fine but will take days to charge say a 60AH car battery. Outputs for bike batteries are lower. So yup will be fine but may take a lot longer than a dedicated car charger or bike charger with switchable output.
Those are my principles...if you don't like them I have others.