Many years ago, I had a custom tar-top battery made by the manufacturer of the Autolite aftermarket battery. I never had the battery filled or charged, always pulling out the off-the-shelf "modern" battery and putting in the dead (but correct) Autolite tar-top after driving to shows.
I will be attending the Palos Verdes Concours d'Elegance next month at Trump National golf course (about 4 miles away), and I know from previous events that they do a technical inspection as part of the judging to ensure everything works - engine, lights, wipers, radio, etc. I think it would not look right if I had to put in the off-the-shelf battery for tech inspection, then swap in the Autolite for the rest of the judging.
I had an aftermarket Autolite in a previous car that spit acid through the red caps onto the underside of the hood, effectively ruining the hood. With the almost unattainable 1st generation hood on my current Pace Car, that would be a disaster.
Should I have my unused Autolite tar-top battery filled and charged, then use it just for inspection, hoping it will "behave" and not spew acid like the previous one? I have no current issues with my generator or the charging system.