How to Replace a Car Key Fob Battery

Car smart key

Short range or an unresponsive button usually means a weak coin battery. Most fobs open without tools.

Step-by-step guide

  1. Find the battery type Check the owner’s manual or the number printed on the old battery, commonly CR2032 or CR2025.
  2. Remove the emergency key Slide the release and pull out the metal key blade. The slot it leaves is often the pry point.
  3. Open the case gently Twist a coin or the key blade in the seam. Work around the edge so the clips do not snap.
  4. Swap the battery Note which side faces up, lift the old cell out and fit the new one the same way. Avoid touching the flat faces.
  5. Close and test Snap the halves together, refit the key blade and test lock, unlock and start.

When to call a locksmith

If the steps above do not solve it, or you would rather not do it yourself, see Key Fob Replacement or browse more how-to guides.

Rather have it done for you? Mobile Locksmith DC is open 24/7 with a 15–25 minute response anywhere in Washington, DC. Call (240) 202-2249.

Locked out or need a locksmith now?

A technician can be at your door anywhere in Washington, DC in 15–25 minutes, any hour of the day or night.

📞 Call (240) 202-2249