Batteries use chemicals to provide the energy necessary to power your car, just like normal batteries. This electricity goes to places like the starter. It keeps the flow of electricity constant as well, so it can keep the engine running.
To know when the battery was shipped to your distributor, look at the four- to five-digit code on the battery cover. The first letter is what month the battery was shipped, starting with A for January and goes down to L for December. The next number indicates the year, where 1 would be 2011 and 8 would be 2008. A battery can last longer than three years, but it’s important that around that point you should have your battery inspected yearly. Short trips and weather also play a part in shortening the lifespan of your battery. You should get it replaced every 5 years at the most (meaning if your battery does have a 1 or an 8 on it, you will want it replaced).
-Rotten Egg Smell- if there’s a rotten egg smell around your battery, that’s your indication the battery acid is leaking. This corrodes the posts (the plus and minus pieces of the battery). The acid will need to be cleaned out of the car, or you risk it not being able to start.
-Slow engine crank- your car takes longer to start up.
-Check engine light- since the battery is the power source of your engine, the check engine light will turn on if your battery starts getting weaker
-Low Battery Fluid Level- Usually, there’s a spot on the casing of the battery you can see through. If the fluid level is below the metal plates inside the battery, you need to get the battery and charging system tested. This normally happens when the car is overheating
-Swollen battery case- Usually, heat causes your battery to swell up. This certainly isn’t good for your battery, for it reduces the battery life. You will likely need to get the battery replaced if this happens.