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What Kind of Battery Does My Key Fob Need?

Power - by Bryan Veldboom - updated on 2/3/2022

Person holding keys at their side walking to a vehicle

Key fobs have changed a lot over the past ten years. What started out as a convenient way of locking and unlocking doors remotely has evolved into today’s modern push start systems. While key fob technology is constantly advancing, their power source has remained the same. Key fobs and other auto remotes are battery-powered. That means that when the battery inside them runs out of power, it needs to be replaced. If you have a key fob that’s not performing the way it used to, Batteries Plus can help. Keep reading for answers to all of your car remote questions, including what type of batteries they require, how long they last and where you can buy a replacement battery.

What is a Button Cell Battery?

Key fobs and other car remotes run on button cell batteries. Button cell batteries are small round batteries used in a variety of common devices. Because of their distinct shape and size, they’re also known as coin cell batteries. Button or coin cell batteries are used to power a number of everyday gadgets, including hearing aids, watches, thermometers, pocket calculators and a variety of games and toys.

How Do I Know What Battery My Key Fob Needs?

One convenient thing about button cell batteries is that they have an identification number printed right on the top. This number, which is usually three to four digits long, will identify the type of battery you’re looking for. The button cell most commonly used in key fobs is the CR2032. Other commonly used button cells include: CR2450, CR2025, CR1616 and CR2016.

If for some reason you can’t find the number on your old battery, you can usually find what type of battery your fob needs in your vehicle owner’s manual. Or, you can stop by your nearest Batteries Plus and one of our experts will help you find the correct battery for your needs.

Can I Replace a Key Fob Battery Myself?

Key fobs aren’t always easy to open. If you know what you’re doing, go ahead and swap out the battery yourself. If not though, you’re better off having a professional do it for you. Otherwise, you could potentially damage the fob. Batteries Plus replaces key fob batteries. For a nominal fee, our experts will swap out your old battery for a fresh new one. We also offer a lifetime replacement option that’s good for the entire life of your vehicle.

What Happens When a Key Fob Battery is Low?

Most key fob batteries will last between three and four years, although some Smart Keys need to be replaced as often as once a year. If you find that your fob doesn’t have the range that it once did, it’s probably due to a low battery. A low battery can also cause fobs to function inconsistently, requiring you to push buttons several times in order to lock or unlock your doors.

How To Make a Key Fob Battery Last Longer

One thing you should never do is leave your key fob in your car overnight. Whenever the fob is in range of your vehicle, it connects with your car’s sensor system. Not only can this drain the battery in your remote, it can potentially kill your car battery too. For this reason, it’s a good idea to always store a key fob at least ten feet away from your vehicle.

Additional Auto Key Services at Batteries Plus

Batteries Plus sells key fob batteries and a whole lot more. If you need a new car remote, take advantage of our key fob programming service. Our customers end up saving up to 50% off what dealerships charge for the same service, plus you’ll have your new fob in about an hour instead of having to wait weeks. Many of our stores offer key cutting as well, so stop in if you need a spare set of keys for your car or truck. Please note that key services aren’t available at all locations, so check with your nearest Batteries Plus for more information.

Want to learn more? We have plenty of helpful tips in our blog. Some related topics include “What Do You Do When Your Car Remote Doesn’t Work?” and “How Far Do I Need to Drive to Charge My Car Battery?

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