2008 Honda Accord Key Fob Battery Replacement | 5 Min Job

The 2008 Honda Accord key fob uses a CR1616 battery with the positive side facing down — replacement takes about five minutes and one small screwdriver.

The 2008 Honda Accord key fob will eventually need a fresh battery, and it’s one of the simplest DIY car fixes you can do. With a CR1616 coin cell and a small screwdriver, you can have the fob working again in about five minutes — no dealership visit required. Here’s exactly what battery to buy and how to swap it.

What Battery Does the 2008 Accord Key Fob Need?

The 2008 Honda Accord key fob uses a CR1616 3V lithium coin battery. This is a common size for key fobs of this era, widely available at Walmart, Amazon, and auto parts stores.

The positive (+) side of the battery must face down into the slot. Installing it upside down is the most common mistake — the fob simply won’t work.

Avoid buying CR2032 or CR1818 batteries. They won’t fit the tray even though some third-party listings incorrectly suggest CR2032 for this fob. Always confirm the “CR1616” marking on the package.

Tools You Need and Where to Buy the Replacement

You need three things:

• A CR1616 battery
• A small Phillips-head screwdriver (precision size)
• A small flathead screwdriver for prying

Remove any keychains from the fob first — they block access to the prying notch.

If your key fob is physically worn or broken and a new battery doesn’t help, check the best replacement 08 Honda Accord keys — it covers OEM and aftermarket remotes that work with the 2008 model.

How to Swap the Battery Step by Step

1. Remove the rear screw. Use the Phillips screwdriver on the screw at the back of the fob. Take it out fully — that makes opening the shell much easier.
2. Open the housing. Insert the flathead screwdriver into the notch on the fob’s side and twist gently to separate the two halves. On 2008–2012 models, pull the bottom cover down and hinge it outward to release the catching lip.
3. Pry open the battery panel. The internal panel that holds the battery lifts out with a gentle twist of the screwdriver or your fingernail.
4. Remove the old battery. Nudge it out with the flathead if it’s stuck.
5. Install the new CR1616. Place it with the positive (+) side facing down, so the “+” aligns with the writing on the housing.
6. Reassemble. Snap the internal panel back in, align the housing hinges, and press the shell closed. Reinsert the screw and tighten gently — the threads strip easily if overtightened.
7. Test it. Press the lock button. If the fob’s light illuminates and the doors respond, the swap worked. If not, the battery is likely upside down or the internal panel isn’t fully seated.

This procedure works for any 2008 through 2012 Honda Accord with the standard four-button remote fob. It does not apply to smart keyless entry systems, which use a different internal setup.

FAQs

Can I use a CR2032 instead of a CR1616?

No. The CR2032 is thicker and will not fit the battery tray in the 2008 Accord key fob. Stick with CR1616 — it is the exact size the fob was designed for and the only one that seats properly.

Why doesn’t my key fob work after a new battery?

The most common cause is incorrect battery orientation — the positive (+) side must face down. Also check that the internal panel is fully snapped into place and the rear screw is snug without being overtightened. If the fob still doesn’t respond, the battery may be dead on arrival.

Does this battery fit a 2010 or 2012 Honda Accord?

Yes. The 8th-generation Honda Accord (2008–2012) uses the same four-button key fob with the same CR1616 battery. The removal steps are identical across all these model years.