You can replace a Honda key fob battery yourself in about two minutes with a coin

Most Honda key fobs use a coin-cell battery — typically a CR2032 or CR2025 — that you can swap out without tools or a trip to the dealer. The battery sits behind a removable cover on the back of the fob. Once you open it, the old battery slides out and a new one slides in. The whole job costs between $3 and $8 for the replacement battery.

You do not need to reprogram the fob after changing the battery. The remote will work when ready once the new battery is in place.

Key Takeaways

  • Honda key fob batteries are coin-cell types (usually CR2032 or CR2025) that you can buy at any pharmacy, grocery store, or hardware store.
  • The fob opens by sliding a small cover off the back or by gently prying the two halves apart with a coin or flat tool.
  • The battery slides out of its holder; note which side faces up before you remove it so you can install the new one the same way.
  • No reprogramming is needed after you install the new battery — the fob will work as soon as you close it back up.

Identify which battery your Honda fob uses

The easiest way to know which battery to buy is to open the fob and look at the old battery itself. The battery type is printed on the flat side — you will see something like "CR2032" or "CR2025". Take a photo of it with your phone before you leave home to buy a replacement.

If you want to know before opening the fob, check your Honda owner's manual or search online for "[your model year] Honda key fob battery." Most Honda fobs from the last 15 years use CR2032, but some older or specialty remotes use CR2025 or CR2016. Buying the wrong size will not damage anything, but it will not fit in the battery holder.

Open the key fob

Look at the back of your fob for a small slot or seam. Most Honda fobs have a sliding cover on the back — you will see a thin line running horizontally across the plastic. Slide your fingernail or a coin into the slot and push the cover toward the top of the fob. The cover will slide off, exposing the battery compartment.

If your fob does not have a sliding cover, it has two halves held together by a seam. Use a coin (a penny or dime works well) and gently pry the two halves apart at the seam. Start at one corner and work your way around. Do not force it — the plastic will separate with light pressure. Once the fob is open, you will see the battery sitting in a metal holder.

Remove the old battery and note its position

Before you touch the battery, look at which side is facing up. The battery is round and flat, and one side has a plus sign (+) printed on it. That side should be facing up in the holder. Take a mental note or a quick photo so you remember this orientation when you install the new battery.

Slide the old battery out of the metal holder. It should come out easily with a fingernail or the edge of a coin. If it is stuck, do not force it — gently rock it side to side until it slides free. Once it is out, set it aside.

Install the new battery

Take your new battery and orient it the same way the old one was facing — plus sign up. Slide it into the metal holder. It should fit snugly and sit flat in the compartment. You will hear or feel a small click as it settles into place.

Do not worry about the battery being too loose or too tight. The holder is designed to grip the battery securely without you having to press hard. If the battery does not slide in smoothly, double-check that you have the right size and that the plus side is facing up.

Close the fob and test it

If your fob has a sliding cover, slide it back on by pushing it toward the bottom of the fob until you hear a click. If your fob has two halves, press them together firmly until the seam closes completely. You should hear a small snap as the clips lock.

Press any button on the fob — lock, unlock, or panic — and point it at your Honda. You should see the lights flash or hear the doors lock or unlock. If nothing happens, open the fob again and check that the battery is sitting flat in the holder with the plus sign facing up. If the battery is positioned correctly and the fob still does not work, the battery you bought may be dead (rare, but it happens). Try a different new battery before assuming the fob itself is broken.

Where to buy replacement batteries

CR2032 and CR2025 batteries are sold everywhere: pharmacies like CVS and Walgreens, grocery stores, hardware stores like Home Depot and Lowe's, and online retailers like Amazon. A single battery usually costs $3 to $5. Some stores sell them in multipacks for $6 to $8, which is a better deal if you have multiple fobs or want spares on hand.

You do not need a special "car battery" or "key fob battery" — a standard coin-cell battery from any brand works fine. Store brands are the same as name brands and cost less.

Frequently Asked Questions

How long does a Honda key fob battery last?

Most coin-cell batteries last three to four years in a key fob, depending on how often you use the remote. Heavy use — pressing buttons multiple times a day — drains the battery faster. If your fob stops working after two years, the battery is likely dead.

What if my fob still does not work after I replace the battery?

First, make sure the battery is installed with the plus sign facing up and is sitting flat in the holder. If it is positioned correctly, try a different new battery — the one you bought may be defective. If a second battery does not work, the fob itself may have a broken button or circuit board, and you will need to contact a Honda dealer for a replacement fob.

Can I use a rechargeable battery in my key fob?

Rechargeable coin-cell batteries exist but are not recommended for key fobs. They have a lower voltage than standard batteries and may not provide enough power to operate the fob reliably. Stick with standard single-use CR2032 or CR2025 batteries.

Do I need to reprogram my fob after changing the battery?

No. The fob does not need to be reprogrammed. Once you install the new battery and close the fob, it will work when ready. Reprogramming is only necessary if you lose the fob or buy a new one.

What should I do with the old battery?

Coin-cell batteries contain small amounts of lithium and should not go in the trash. Most pharmacies and electronics stores have battery recycling bins near the checkout. You can also check Earth911.com to find a recycling location near you.