Re: How common a practice is this?.
A lot of Classic Car dealers will install 8V batteries to make certain the car would crank and start quicker. I purchased a real nice '40 Ford Conv. several years ago from a dealer and it had an 8V battery installed. Removed it when I got home in favor of a 6V battery. Better to fix the problem instead of installing an 8V battery.
Stay Safe,
Pat
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