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If it is the smart key version, the battery should be replaced every year. Also, do not get the thing wet, as corrosion will cause need for replacing it prematurely.

The regular fob batteries should be replaced every 3-5 years.

The original batteries could have been a few years old when the vehicle was built, so perhaps the maker of those remotes was still going through old inventory.

Replace before needed, just like for the smoke detectors at home

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13y ago
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Q: What is life of battery in Toyota Highlander key fob?
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