[RH77]

I rarely have a problem, including on an old 8-year batt (which, in full disclosure) was recently replaced by choice because the car sat for a few months and the battery lost conditioning.

The vehicles you may have to watch are those built in the last 5-years or so. Remember: higher compression ratios requires more cranking amps. For me, reliance on the battery for A/C air recirc with med-hi fan while sitting/waiting, with headlights, radio, and other "phantom loads" led to a dead battery twice -- it was replaced within the last year on the '06 Acura TSX that succumb to the issue. Older models don't suffer nearly as much...

EDIT: While storm-spotting, I often need large power draws to transmit radio communications. It's not as exciting as TV would promote: it takes a lot of sitting and waiting. During rain, running the wipers, A/C recirc for defogging during heavy rain, and maintaining radio comm, quickly dwindles the available voltage with the engine off. On the Integra, I would start-up and charge the system when the SG-II voltmeter showed 11.0V or less. In this situation a dead battery could leave you in the path of something rather unpleasant...

RH77