Keyfob Battery Replacement: A Simple Guide

by Phil Borges // in Car


Replacing the battery in a key fob is a straightforward DIY task anyone can handle at home with a few simple tools. Before starting, identify the correct replacement, often a CR2032 or similar coin battery.

Here’s a quick rundown:

  • Begin by retrieving the spare key attached to the fob and set it aside.
  • Use a flathead screwdriver or a similar prying tool to gently separate the two sections of the key fob. Work carefully around the seam to avoid damage.
  • You’ll notice the old battery nestled in one half. Pry it out cautiously.
  • To install the new battery, ensure the positive side faces downward. Press one edge against the compartment’s spring, letting the other side slot in place.
  • Realign the halves: one housing the new battery, the other containing the electronic circuit.
  • Apply gentle pressure until they click together.

After reassembling your key fob, test all buttons to confirm functionality. Problems could indicate an improper fit, a faulty battery, or the need for reprogramming which might need professional assistance from a locksmith or dealership.

Regular maintenance of your car’s remote control is essential for an uninterrupted experience, whether it’s to lock/unlock doors, open the trunk, or start the engine, especially with features like push-button start in vehicles like Toyota or Hyundai.

Keyfob Battery Replacement Q&A

Replacing Your Toyota Car Key Fob’s Battery

Changing the battery in your Toyota car key fob is a simple process. First, locate a small notch or indent on the side of the fob. Use a flat-head screwdriver to gently pry open the fob. Once open, remove the old battery, noting the positive and negative orientations for reference. Insert the new battery with the positive side facing the correct direction, and then snap the fob back together.

Locations to Replace Your Car Remote Battery

You can have your car remote battery replaced at various locations, such as electronic stores, automotive lock shops, or dealerships. Some large retail stores also offer automotive sections where you can purchase batteries and sometimes get them replaced.

Suitable Battery Types for Key Fobs

The suitable battery for a key fob is usually a coin-shaped lithium battery. The most common sizes are CR2025 and CR2032. To ensure you get the right type, check your vehicle manufacturer’s guide or the current battery’s engraving for the correct specification.

DIY Key Fob Battery Replacement

Yes, it’s possible to change the key fob battery on your own. With the right type of replacement battery and a small screwdriver, anyone can replace a key fob battery. It typically involves opening the case and swapping out the old battery for a new one.

Weak Key Fob Battery and Car Starting Issues

A weak battery in the key fob might prevent the car from starting if the vehicle relies on the fob’s proximity for the push-to-start function. In such cases, replacing the battery should resolve the issue.

Steps to Insert a New Key Fob Battery

Inserting a new battery into a key fob involves several straightforward steps:

  • Open the key fob: Usually, a seam is visible where the two halves of the fob can be gently pried apart.
  • Identify battery type: Observe the old battery to check the size and voltage needed for the replacement.
  • Remove the old battery: Be mindful of the orientation to place the new battery correctly.
  • Place the new battery: Insert the new battery with the positive (+) side facing up.
  • Reassemble the key fob: Carefully align the two halves and press until they snap shut.

About the author, Phil Borges