View Here : How Long Does A Car Battery Last
Long story short, you can get a new battery that will fail in a few years or a good one that will last 7 or more. If yours still meets specs, keep it a little longer. If you plan on crossing the Klondike or the Sahara with it, maybe a new battery would be in order.
Kirkland Car Battery. The original Kirkland car battery had quite the reputation for its long lifespan and even longer warranty. With an average lifespan of 7 years along with a 100 month warranty, customers were pretty much guaranteed a percentage of their a pro-rated warranty credit.