What battery does Lexus key use?

The typical battery for a Lexus key fob is a CR2032 3V lithium coin cell. Some older or regional variations may use CR2025 or CR2016.

While CR2032 is the standard for most current Lexus key fobs, the exact size can vary by model year and market. Always verify by checking your owner's manual or inspecting the back of the fob for size markings, and purchase the correct coin cell from a reputable retailer to avoid compatibility issues.

Common battery types across Lexus fobs

Below is a snapshot of where different battery sizes show up in Lexus key fobs, highlighting the most common choice and the potential exceptions.

• CR2032 3V lithium coin cell — the default for most modern Lexus fobs used on recent model years and widely available.


• CR2025 3V lithium coin cell — used in some older or smaller, regional fob designs; may appear in certain markets.


• CR2016 3V lithium coin cell — rare, found in a few slim-key configurations; verify before purchasing.

For most owners, CR2032 will be the correct choice. Always confirm the exact size on the fob or in the official manual before buying a replacement.

How to confirm and safely replace the battery

Before you replace the battery, confirm the correct type and prepare a safe, simple replacement process. Here are practical steps to follow.

1. Check the model year and key design in your owner's manual or on the Lexus support site to confirm the battery size.


2. Open the key fob casing carefully, using a small flat tool if needed, and avoid forcing parts to prevent damage to the electronics or seal.


3. Remove the old battery and dispose of it properly according to local regulations; keep the fob clean and dry.


4. Insert a new CR2032 (or the exact required size) with the correct orientation, reassemble the fob, and test all functions to ensure full operation.

With the new battery in place, you should regain normal range and reliability. If the fob still doesn’t work after replacement, contact a Lexus dealer or an automotive locksmith for further diagnosis.

Summary

In most cases, Lexus key fobs use a CR2032 3V lithium coin cell. Some older or regional variants may use CR2025 or CR2016, underscoring the importance of verifying the exact size from the manual or the fob itself. Replacement is typically quick and inexpensive, and proper disposal of old batteries is recommended. When in doubt, seek professional assistance to ensure your fob functions correctly.

What kind of battery is in a Lexus key fob?

First right positive and negative now to open this fob. Right there it says push. You got to push that.

Can I use CR2032 instead of CR2025 in a key fob?

Yes, you can likely use a 2032 battery instead of a 2025 in your key fob, as both are 3V and the 2032 is thicker with higher capacity, meaning it may last longer. However, check if the extra thickness will prevent the fob from closing properly, as forcing it could damage the device. If the 2032 is too tight, stick with the 2025. 
Key differences and considerations

• Size: The CR2032 is $3.2$mm thick, while the CR2025 is $2.5$mm thick. 
• Voltage: Both have the same 3V output, so the device will function correctly if the battery fits. 
• Capacity: The CR2032 has a higher capacity, which can lead to a longer lifespan. 
• Fit: The main issue is the CR2032's extra thickness. It might be too tight to close the fob, or the extra pressure could cause damage. 
• Outcome: If the 2032 fits and the fob closes without force, it should work fine and may last longer. If it's too tight, it's safer to use the correct 2025 size. 

How to change the battery in a 2019 Lexus key fob?

To replace the battery in a 2019 Lexus key fob, remove the mechanical key, use the key or a flathead screwdriver to pry open the fob cover, and replace the old battery with a new one of the correct size, ensuring the positive (+) side is facing up. For most 2019 Lexus models (e.g., ES, GS, IS, LC, LS, NX, RC, RX, UX), the battery is a CR2032 lithium coin battery, while some models like the GX 460 use a CR1632.
 
This video shows how to change the battery in a Lexus key fob: 57sPYR Automotive YouTube · Aug 10, 2021
Step 1: Remove the mechanical key 

• Locate the release button on the side of the key fob and slide it to unlock the mechanical key.
• Pull the mechanical key blade out of the fob. 

Step 2: Open the key fob 

• Look for a small slot in the opening where the mechanical key was. 
• Insert the tip of the mechanical key or a small, flathead screwdriver into the slot. 
• Gently twist to pop the cover of the key fob open. 
• Some fobs may have an electronic key module over the battery; remove this first if necessary. 

This video shows how to open a Lexus key fob: 40sKey Fob RobYouTube · Jul 1, 2025
Step 3: Replace the battery 

• Use the flathead screwdriver or a paperclip to carefully pry out the old battery. 
• Insert the new battery with the positive (+) side facing up. 
• If you have a CR2032 battery, you can find it at most drugstores, hardware stores, or online retailers. 

Step 4: Close the key fob 

• Snap the key fob cover back into place. 
• Slide the mechanical key back into the fob until it clicks securely. 
• Test the key fob by pressing a button to ensure it's working. 

What battery for 2017 Lexus RX350 key fob?

The correct battery for a 2017 Lexus RX350 key fob is a CR2032 3V lithium coin battery. To replace it, use the physical key to open the fob, pry out the old battery, and insert the new one with the positive (+) side facing up. 
This video shows how to replace the battery in your Lexus key fob: 13sKey Fob RobYouTube · Nov 30, 2023
Step-by-step replacement guide

1. Release the mechanical key: Press the small button on the key fob to release the physical key, then pull it out. 
2. Open the key fob: Insert the physical key into the small slot on the side of the fob and gently twist it to separate the two halves. 
3. Remove the old battery: Pry out the old battery. A small flathead screwdriver can be helpful for this. 
4. Insert the new battery: Place the new CR2032 battery into the compartment with the positive (+) side facing upwards. 
5. Close the fob: Snap the two halves of the key fob back together and re-insert the physical key.