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To replace the battery in your 2015 Honda Odyssey's key fob, you will need a 3v CR2032 cell battery. Make sure to have a precision screwdriver handy, either a single one or a set. Start by pressing the release button on the back of the fob to remove the physical key. Insert the screwdriver into the area where the key was, locating a small hole to separate the key fob. Once opened, you can access the battery. Use the screwdriver to lift it out, replace it, and then reassemble the key fob without any issues.
The key fob for a 2015 Honda Odyssey requires a 032 3-volt lithium coin battery.