What size battery does Acura FOB take?
The standard battery for most Acura key fobs is a 3-volt CR2032 coin cell. Some older or specialty fobs may use CR2025 or other sizes, so it’s best to verify your exact model by inspecting the fob or checking the owner’s manual.
Common battery sizes for Acura key fobs
Overview of what you might encounter
Here are the sizes you are most likely to encounter when replacing an Acura key fob battery.
- CR2032 — The standard 3-volt coin cell used by the majority of current Acura key fobs (models like TLX, RDX, MDX, ILX, etc.).
- CR2025 — A thinner 3-volt coin cell used in some older or specific fob designs; verify by removing the back cover or consulting the manual.
- Other small-size variants (less common today) — A minority of very early or regional fobs may use a different size; always confirm the exact size for your unit.
Battery compatibility can vary by market and model year; when in doubt, contact a dealer or reference the owner’s manual to confirm the exact size for your fob.
How to replace the fob battery
If you need to replace the battery yourself, these general steps apply to most Acura key fobs. Procedures can vary by model, so consult the owner’s manual if you have any doubt.
- Identify the correct battery size for your fob (most commonly CR2032) and gather a spare.
- Turn off the vehicle and remove the fob from use to avoid transmitting signals during the process.
- Locate the seam or small release point on the back of the fob and carefully pry the two halves apart with a thin tool or your fingernail.
- Note the orientation of the existing battery (positive side facing up in most designs).
- Remove the old battery with a non-metallic tool to avoid shorting any circuits.
- Insert a new battery of the same size, ensuring the correct orientation (+ side up).
- Reassemble the fob halves and press firmly until they snap back together.
- Test the remote by pressing a button to confirm the signal is functioning properly.
If the remote still doesn’t work after replacing the battery, try a new battery again, check the gasket seal, or consult a dealership or automotive locksmith for a diagnostic.
Summary
Across most modern Acura models, the key fob uses a 3-volt CR2032 coin cell, with CR2025 or other sizes possible in older or specific designs. Always verify the exact size for your fob by inspecting the unit or consulting the owner's manual, and follow proper steps to replace the battery. When in doubt, professional service can ensure the fob remains water-tight and fully functional.
