groundcover
Veteran Member
Just replaced the Auto Zone batteries in my F350 diesel after 10 years, they were still starting but getting a bit tired,They still had them in the computer,I was impressed !
I must expect a lot more from a battery than you do.5 years on a battery is almost as good as they come.
Here are the things I have learned about batteries working in the auto industry:
A battery is only designed to last a little longer than the warranty period.
They wouldn't only offer a 48 month warranty, (it is a selling feature to offer a long warranty period), if they designed it to last 8 years. They design the 48 month to last somewhere over 50 months.
A small percentage don't make it to the end of the warranty, and some make it well past. In a car, with normal usage, if your beyond a year out of warranty, your lucky.
I recently replaced a 6 year battery, that was 7.5 years old from my main vehicle. It was still working fine. To me there is no point in trying to go through another winter, just to see if it will make it. When it comes up short, it's going to do so on the coldest night.
Manufacturers say leaving the headlights on, and fully discharging your battery, is the fastest way to shorten it's life. Fully discharging an older battery can damage the plates to the point that it will not take a charge.
Using a trickle charger on equipment batteries will help keep sulfur from accumulating on the plates during storage periods, and extend it's life.
Always replace a battery with the largest one that will fit. Larger size, usually means larger capacity. A good battery manufacturer will tell you what the reserve capacity for the battery is. A half dead over sized battery, may still work in your application for years.