Your car battery is the unsung hero of your on-the-go lifestyle. Day in and day out, it gives your engine the spark it needs to get going. But just like any other car part, a car battery has a lifespan – and you don’t want to be stuck when it finally bows out. Here’s a few signs to look out for so you can spot when your battery is going bad, and the best solution for replacing it.
CORROSION
When most people think of vehicle corrosion, they picture rusted-out fenders from winter beaters driven in northern climates. But an even more common instance of corrosion occurs where the battery connects to power cables. Using the procedure in our May ‘26 article, find your car battery and give it a visual check. You are looking for a greenish-grey crumbly buildup on the connections. If the battery clamps have a heavy coating of corrosion, it’s a fair sign the battery hasn’t been changed or maintained in a while. Inside the battery, lead plates are bathed in sulfuric acid, and over time hydrogen gas can leak into the atmosphere. That gas reacts with the copper metal found in the battery connections and creates copper sulfate, which is what makes up the corrosion you see.
PHYSICAL DAMAGE
Car batteries can be exposed to a lot, depending on where the auto manufacturer puts them. A battery under a car seat or in the trunk will lead quite a different life than one under the hood by the radiator. Batteries are much better protected now than they were decades ago, but damage can still occur. Vibration caused by driving on rough roads can shake loose the actual components inside the battery, disrupting connections or even allowing components to touch that should stay separated. A loose or missing battery hold-down can also lead to unnecessary vibration or physical damage to the case. Extreme cold weather can actually freeze the battery and lead to a cracked battery case. Any damage to the outside case is cause for immediate replacement, as the risk of leaking dangerous sulfuric acid is too great.
AGE
While your battery does not have an expiration date on it like the milk in your refrigerator, it does have a few tell-tale signs to calculate the approximate age and in-service time. The most obvious one is the purchase date sticker. This sticker is usually rectangular, with round circles featuring the 12 months of the year, abbreviated to two letters and the number 1-10 to denote the year within the purchasing decade. The round circles are designed to be removed. The sticker works in reverse, as removing a circle marks the date/year. For example a missing “JA” sticker with a missing “2” sticker would denote a purchase date of January 2022. If the purchase date is older than five years then you are probably due for a replacement.
Unsure if your battery’s dead, or only sleeping? Stop by 2880 Rt. 9 in Valatie or 20 Church St. in Chatham to ask the Expert – we’re happy to help.
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