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Wow - that's a normal car battery for doing normal battery things? Or is a fancy one that gets used somewhere other than were you'd expect it.
It's a start/stop car, so it has to be happy being discharged to run all the auxiliaries for a while when the engine is stopped, plus smoothly restart the engine. Over and over and over again.
That would quickly kill a cheapo starter battery.
Wow - that's a normal car battery for doing normal battery things? Or is a fancy one that gets used somewhere other than were you'd expect it.