How to Replace the Battery in a Smart Key

Remove the key from the handheld remote. This process depends on the type of handheld remote you have. For cars, the physical key is usually stored inside the remote when not in use. You’ll need to open the remote to take out the key (in some cases, the physical key is designed to be easily detachable). The key can be released from the remote by sliding or pressing a button.

• A handheld remote with a sliding key will have a small button at the top. Press and hold this button while pulling the key out.
• For a handheld remote with a flip-out key, press the button on the key fob or pull the key upward/forward to release it.

Unscrew the back of the handheld remote. Flip the device over, and you’ll notice at least one screw securing the plastic cover. These screws are tiny, so a small Phillips-head screwdriver is necessary. Proceed gently to avoid stripping the screw threads.

• Store the screws in a safe place, such as a zipper bag or small cup, to prevent losing them.

Insert a coin into the slot on the side of the smart key and twist (if applicable). Most (but not all) smart keys feature a small slot on the side. Insert a small coin or flathead screwdriver into the slot, then pry or twist to separate the key into two halves.

If there’s no slot, pry the key cover open. If no slot is present, you’ll see a seam running along the edge where the two halves of the key meet. Insert a flathead screwdriver into the seam and gently pry to split the key apart.

• The battery cover will come off more easily if you work the screwdriver around all edges of the key. Insert a knife or screwdriver into multiple points along the seam to separate the two halves.

Pry the battery out using a screwdriver. The battery resembles a small silver coin located in the center of the key. If sliding the battery out with your fingers doesn’t work, use a screwdriver or a paperclip to gently pry it out. Insert the flat end of the screwdriver beneath the battery, lift slightly, and remove the battery.

• On some smart keys, the battery is held in place by a clip. Use the screwdriver to lift the clip and remove the battery. Be very gentle to avoid damaging the clip.

Insert the new battery into its slot. Place the new battery in its original position. Check the plastic cover for a diagram showing the correct battery orientation. Typically, the battery fits snugly with the positive side facing up. Once the battery is properly placed, no further action is needed.

• Smart keys usually use small coin-shaped batteries, such as CR2025 or CR2032. These are commonly available at department stores, bookstores, hardware shops, automotive supply stores, and similar outlets.
• To ensure you purchase the correct battery type, refer to the smart key’s user manual or check the label on the old battery.

Tighten the screws to reassemble the key. Reattach the back cover of the smart key and press it down until you hear a click. Then, tighten the screws clockwise until the two halves of the key are securely fastened.

Test the key. Point the smart key toward your car, motorcycle, or other device and try using it. The key should work immediately. If it doesn’t, the battery might be inserted incorrectly. Open the key cover again to check. If it still doesn’t work, the smart key might be damaged.

• Take the smart key to a car dealership or a professional locksmith for repair. You can also purchase a new handheld remote and program it yourself.

• Phillips screwdriver
• Flathead screwdriver
• Fresh batteries