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The battery needed for the 2011 Toyota RAV4 key fob is a CR2016, a commonly available size that can be found at most stores for about $1 each. If you prefer a premium brand, you may have to pay up to $5 per battery because the key fob is an important part of your vehicle's function. Changing the battery is a straightforward process that should only take a few minutes. Use a flathead screwdriver or another small tool to open the key, then replace the old battery with the new one and reassemble the key fob.
Use a flathead screwdriver or a similar tool to take off the back cover of the battery and swap it out with a fresh one. Then, put the back battery cover back on.