Except when they don't.If the car won't start because of a weak battery, they test it and the alternator. If the battery tests bad they put in a new one on the spot.
Small examples: I have 2 friends with oddball BMW. One has battery under rear seat, other has battery in/under trunk. Do you think AAA tow truck will have complete assortment of batteries on board? In all areas? 24 hours a day?
They will flat bed it to home or repair shop.
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