Key Fob Replacement Batteries for Toyota (Sienna, Corolla Cross, RAV4 Prime, Venza, Prius, Tundra, Grand Highlander, Tacoma, Crown, Sequoia, bZ4x) Smart Proximity Remote (2-Pack) (Check Fitment Guide)

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I didn't read carefully enough when I ordered these CR2450 coin batteries. They don't fit the fob for the 2018 RAV4 and 2017 Sienna -- both require the smaller CR2032.It's good to know that these batteries are used by car manufacturers, but really, the battery's manufacturer doesn't matter as long as it's the right type. You can buy any CR2450 since batteries are governed by standards. I was surprised that they are Panasonic branded.To open the fob, take the emergency key out and poke it into the horizontal slot. Then give it a gentle twist. The two halves of the plastic casing will open up. No need to go to your dealer or other place to do this. It just takes 2-3 minutes.Your fob may be different, but the battery is on the underside of the printed circuit board on my fob.

This key fob battery worked great for my 2019 Toyota Corolla. Nice to have extras as you never know when you will need one. Would buy again.