Battery Longevity Info.

Why? When the battery actually fails, it can often mess up the alternator and/or voltage regulator. The 6-volt generator system in my 8N is a good bit sturdier than an alternator, but I will still replace the battery in a couple of years even if it is still working. Unexpected failures just suck.

I usually buy 60-month batteries and replace them when they are 4 to 4.5 years old. The last 60-month battery I bought was $35, Cheap. A premium battery might last a couple years longer but stretching the life as long as possible does not seem like a good bet to me when I am risking the hassle of a sudden failure and damage to other parts. I buy mid-range quality batteries on sale and replace them before they have a chance to leave me stranded somewhere.

This same philosophy applies to things like tires, hoses, belts, etc. Should I replace the hoses now, or let them go another year and risk having to replace the cylinder head?

My 2-cents
kl

That's a good record.

Unlike many things storage battery longevity has improved over the years. The Diehard (for a Honda Civic) in my Kubota diesel is nearly 10 years old and, though showing signs, I was still able to start it last winter to plow snow.

Using only distilled water and charging them every 4-6 weeks when not in regular use makes a big difference in service life.

Dean