While predicting battery life isn't an exact science, there are a lot of factors that can affect it, as well as indicators that can let you know your battery may be on its last leg. When it reaches three years of age, it's good practice to watch for signs that your battery could fail. Keep an eye on your lights when the engine is off. If they're dim, your battery is getting weak. Similarly, watch for warning lights, corrosion on the battery's terminals and difficulty starting your engine. Should any concerns arise, be sure to stop by Toyota of Somerset so we can test your vehicle's battery and advise you on the best course of action.