How to Replace the Battery in a 2020 Lexus ES 300h Key Fob

How to Replace the Battery in a 2020 Lexus ES 300h Key Fob

If your ES 300h remote key fob isn't working well, the cell battery more likely needs to be changed. In this article, we demonstrate how to open Lexus keyless entry remote and replace a weak battery yourself. If you choose to do it at home near ES 300h, follow our instruction, but first make sure you have all you need.

What type battery keyless entry remote use

Changing battery in remote key fob require flat head screwdriver and CR2032 battery. Prepare these materials and tools before opening and make sure to match the size of your fob’s batteries.
  • 1xCR2032 battery
  • flat head screwdriver

Step by step instruction

Inside of your key fob installed small button battery. Remove any internal key first, and then try to pry apart the remote key fob.

Gently try to open your fob with flat head screwdriver. Replace 1 CR2032 battery with flat head screwdriver.

Now it's time to install new battery inside fob’s case. Every battery has a negative and positive side and if you put the wrong connector down, the current cannot go into your circuit board and make it work. Check polarity on battery, by "+" mark.

Before assembling keyless entry fob's case, verify that all functions works by pressing buttons on circuit board.

At this point squeeze fob’s back cover together. Line your shell two halves together and assemble it together by hands from top to bottom. If your fob case tightly closed, we done. If not, repeat the last step.

How to replace the battery video guide

How-To Replace Smart Access Key Battery | Lexus

Still not working? Buy new one


Key fob of Lexus ES 300h use 1xCR2032 batteries. Price for CR2032 batteries are under $5 depending on the brand, size packaging and type you buy. Take your old battery to the store, to be sure.

Often, after key fob battery change, reprogramming not required. Keyless entry remote reprogramming procedure often described in user's manual of your vehicle.

Yes, you can change battery in your 2020 Lexus ES 300h remote key fob yourself. Most hard part is to open keyless entry fob's case. It's pretty simple with our step by step guide.

Dealer service cost for replace the battery in fob is from $30 to as high as $500 depending on the car.

You should change batteries inside key fob of Lexus ES 300h at least every 4 years. The term of battery vary on frequency of use, operating conditions and quality.

These symptoms will warning you that it's probably time to replace battery in your Lexus ES 300h: signal strength reduced, key fob buttons not working, multiple clicks to unlock or lock doors required and low key battery indicator on dashboard.
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Fob Compatibility:

  2. Models: 2019-2020 Lexus ES 300h