Originally Posted by
seedsbelize2
The rationale says that there is so much background stuff going on in today’s cars, that if they don’t get driven enough, that background stuff kills the battery.
This is not true. You can check for a parasitic draw with an ammeter. It's recommended to be less than 50ma. When I have checked cars it's typically less than 20ma.
Of course if you don't drive it for a month it may go down.
Part of the issue is the reduction of weight in batteries. Also, quality control can be worse than years ago. And luck is involved.
Our cars each have 5ish year old batteries and Mrs rarely starts her car. I had a cheap Wal Mart battery for 8 years in a truck I sold.