How to Replace the Battery in a 2018 Lexus RX 450h Key Fob

How to Replace the Battery in a 2018 Lexus RX 450h Key Fob

If your car remote key fob is not unlock doors properly, the cell battery surely needs to be replaced. In this post, we explained how to open your car keyless entry remote and replace your Lexus key battery.

What type battery does 2018 Lexus RX 450h remote key fob take

Before you start to open keyless entry remote be sure that you have all recommended tools and materials: flat head screwdriver and CR2032 battery.
  • flat head screwdriver
  • 1xCR2032 battery

Step by step guide

Inside of your key fob installed small coin cell battery. Move the key out of the way if it is in the key fob.

Carefully try to disassemble your remote key fob with flat head screwdriver. Remove one CR2032 battery with flat head screwdriver.

Get new battery and install it in fob’s body. 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 position on battery, by "+" mark.

When the new battery installed, verify remote key fob by pressing buttons. If everything working fine, assemble your fob’s body in reverse order.

The last thing to do is put your cover back on fob. Carefully try to put the two halves in place by hands from top to bottom. If your key shell firmly closed, we done. If not, repeat the last step.

How to replace the battery video instruction

DIY - LEXUS How to change SmartKey Key fob Battery on Lexus RX350 ES350 RX450

Still not working? Buy new one


Remote key fob of Lexus RX 450h use 1xCR2032 batteries. Price for CR2032 batteries are under $4-6 build upon the brand, type and size packaging you buy. Take your old battery to the store, to be sure.

Often, after keyless entry remote battery replace, you do not need to reprogram. Don't be scare of this procedure, because often it's described in user's manual.

Changing your keyless entry remote battery is simple to do in 2018 Lexus RX 450h. Most of car manufacturers think of the customers and make a special hole for keyless entry remote open.

Car service pricing for replace the battery in fob is from $30 to as high as $500 depending on the brand.

Keyless entry remote batteries in Lexus RX 450h should be replaced every 3-4 years, although this will vary based on usage and quality. If your keyless entry remote reduced signal strength, you should replace batteries before it stop open doors and make trouble for you.

If your Lexus need multiple clicks to unlock or lock doors, key fob buttons not working, signal strength reduced or fob's battery more than 4 years old, in most cases battery change inside remote key fob needed. Current battery is dead or weak with a high probability, but if it's not help to fix issues, key change or repair required.
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Fob Compatibility:

  2. Models: 2016-2018 Lexus RX450h