What is a common sign that a battery may be failing?

A common sign that a battery may be failing is difficulty starting the vehicle. When a battery begins to lose its ability to hold a charge, it often results in insufficient power being supplied to the starter motor. This can manifest as slow cranking, clicking sounds when you attempt to start the engine, or even a complete failure to start.

In healthy batteries, consistent voltage readings usually indicate the battery is functioning properly, meaning that they're not typically a sign of failure. High amperage readings do not directly indicate battery health; instead, they reflect the amount of current being drawn, which can vary based on the electrical load the vehicle is demanding. Finally, a stable battery temperature does not signify a failing battery, as changes in temperature can occur for various reasons and do not necessarily correlate with battery health. Therefore, difficulty starting the vehicle is a clear and practical indicator that the battery’s performance is compromised and might necessitate replacement.