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That's a tough one, but I would guess the answer is "when it stops working". That is a true indication that the battery is dead. But don't call a locksmith, because you can still open your door manually with the key... yes, you can, even if the battery key is dead.

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14y ago
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Q: How do you know when the remote key battery needs to be changed on a Toyota 2007 rav4?
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