If you own a 2016 Lexus and have lost or damaged your key fob battery, do not worry! You can easily replace the battery yourself. However, note that key fob batteries are not standard, so you will need to purchase a replacement battery specifically designed for your Lexus key fob. Here is how:
1. Locate the screws on the back of the key fob.
2. Remove the screws with a Phillips head screwdriver.
3. Gently open the key fob case and remove the old battery.
4. Install a new CR2032 battery, making sure to orient it correctly according to the markings on the case.
5. Close the key fob case and reattach the screws.
Replacing the battery, you may also want to consider getting a new key fob if you have lost or damaged your original. Keyless2Go offers a wide selection of replacement key fobs for many different car makes and models, so you can find the perfect one for your needs.
In addition to replacing a dead battery, you may also need to replace the entire key fob if your remote entry is not working. This can be caused by a problem with either the fob or its transmitter. In this case, most auto locksmiths will have the necessary equipment to troubleshoot and repair your keyless entry.
Replacing the battery in your Lexus Key FOB will ensure that it functions properly. Replacing the Lithium coin cell battery in your Key FOB can also conserve its memory, which is necessary for many of the advanced features like rolling codes. Using an incorrect Lexus key fob battery may cause your Key FOB to malfunction. The CR2032 type battery is the most common found in Lexus car key remotes.

We can conclude that: Lexus key fob battery type is CR2032 and its location is behind the cover on the back of your remote, and it will cost you $3 to change it yourself. However, if you want to get a new key fob, it will cost you $150. If you want to save money, that is your choice.