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When is it Time to Replace a Key Fob Battery?
secondary May 14

When is it Time to Replace a Key Fob Battery?

Technological enhancement and massive investment in research have contributed to the evolution of car keys. It is no fault of the car manufacturers – since criminals are not relenting in their quest to decode vulnerabilities in car security systems.

As a result, many car keys are equipped with advanced electronic features that enhance security and convenience. These electronic keys rely on batteries to power their functions, and like any battery, they eventually require replacement.

So when is the right time to replace your car key battery? You will definitely get answers in this article. Read on to learn more.

Modern Car Key Batteries

Most car key fobs use small, button-type batteries known as a coin or watch batteries. These batteries are typically lithium-based and have a lifespan ranging from one to five years, depending on usage. The specific type of battery used can vary across different car brands and models. Before you can determine when to call a locksmith for car key replacement, you have to understand the red signs to look out for.

Signs it is Time to Replace the Car Key Battery:

  • Diminished Range

As a car owner, you should get comfortable with the range your key fob operates. If you need to stand closer to your car or point the key directly at the vehicle to unlock or lock, it's a sign that the battery is getting weak. Since the range has suddenly dropped, you can consult a locksmith or go to any departmental store to get a new battery. The range of your key fob should be consistent throughout its lifespan.

  • Unresponsive Key Functions

Have you noticed that your key fob requires repeated button presses or needs to be held closer to the vehicle for it to work properly? Normally, this is not the way it functions! The overall responsiveness of the key fob has decreased. If you experience such issues, it indicates that the battery is nearing its end.

Consult an expert locksmith from Top St. Louis Locksmith for key fob programming or battery replacement.

  • The Key Fob Stops Working

Damaged internal components transmitter/receiver or weak batteries can cause the key fob to stop working. When this happens, you don’t have to panic. The first step is to change the batteries. It should start working. If not, try resetting the remote. When this is done properly, the transmitter and receiver will pair and your fob will start functioning once more.

If the above tips do not solve the problem, consider car key replacement.


A dead car key battery can cause inconvenience and frustration, especially when you need to start your car urgently. That is why replacing a car key battery is an important aspect of car maintenance that should not be overlooked. It is essential to pay close attention to the signs that indicate that the battery is dead or dying and replace it instantly. To avoid getting stranded when your key fob stops working, consider having a spare battery on hand.

At Top St. Louis Locksmith, we can help change your key fob batteries and also fix any security issues with your car. Do not hesitate to call us when you need the services of a locksmith in University City.