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The key fob for the 2016 Honda Odyssey is powered by a CR2032 battery, which is commonly used in small electronic devices. You can find this battery in a compartment within the key, and it's easy to replace by prying it open. It's important to have a new battery ready to go because some cars require the fob battery to be functioning in order to start the car. Make sure to keep a fresh battery handy to avoid any delays in starting your car, especially if you're in a hurry to move your car from a restricted parking spot. You can purchase these batteries for around $1 to $3 at most stores, making them readily available.
The Honda Odyssey from 2016 requires a CR2032 3V lithium battery.