Letting a battery go until it dies can mean an expensive tow.

Letting a battery go until it dies can also mean the risk of an open cell developing, not common but it does happen and it means that the battery cannot filter the crap coming off the alternator (and the spike from the starter) very well - which puts the car's sensitive modules at risk.

So, do what you want to with YOUR car. As for me, I learned a LONG time before I bought a Crossfire to replace the battery every four years. I buy the cheapest battery that meets the specs and at four years, its outta here. OH, but I don't always follow my own rules, the SE (which I just bought last year) had a 2011 battery in it and I did not get with it and replace last year at four years. SO, it acted up a few months ago and lighted the Airbag light when it died. I bought a new battery but now I need a new airbag module.

So, if the Pizza in a dunce cap cant learn from his own experience, maybe some of the rest of you can.

Or not, whatever, it's your car and your wallet. So, stick with that old battery until it dies -just dont expect any sympathy from me when you end up with a bad airbag, top control, engine or other module gone bad.

Funny, I'm a 34 year veteran electronics technician (Now a Field Applications Engineer with JVCKenwood) and even I screwed up, didn't I? I guess I can't bite anyone else's head off if I knew better and still procrastinated.