Most of today’s car batteries are maintenance-free, sealed and can last more than 3 years. Having engine trouble is often the first sign your battery needs replacing. Although this is less an auto repair than a replacement, it’s important to make sure your battery is working right.

Slow cranking, mishaps with electrical components, and funny smells are all signs your battery may be on its way out. Cold and hot weather can both take a toll on overall battery life – make sure your battery is up to par.