Most 2011 key fobs use a 3-volt coin-cell battery, with CR2032 being the most common. However, exact size varies by make and model; some vehicles may use CR2025, CR1616, or, less often, a different type. Check your owner's manual or inspect the fob to confirm the correct cell.
Common battery sizes used in 2011-era key fobs
Coin-cell cells come in several sizes, and 2011-era remotes span a few of the usual options. The following sizes are the ones most often encountered in that year range.
- CR2032 — 3V coin cell; by far the most common choice for many makes and models of 2011-era fobs.
- CR2025 — 3V coin cell; slightly thinner, used in some models where space is tight.
- CR1616 — 3V coin cell; found in smaller or slimmer fobs for a few models.
- A23 (also called 23A) — 12V battery; used in a minority of older or specialty remotes.
Note: exact compatibility varies by vehicle. If you’re unsure, verify by consulting the owner’s manual, dealer, or a trusted automotive battery retailer, rather than assuming based on year alone.
How to identify the correct battery for your specific vehicle
To avoid buying the wrong cell, use these checks to pinpoint the right size for your 2011 fob.
Check the owner’s manual or the manufacturer's site
Look up “key fob battery” for your make, model, and year. The official guidance will specify the exact cell size and replacement steps for your vehicle.
Inspect the fob and look for size markings
Some remotes have the battery size printed on the back or inside cover once opened. If not, you can compare the battery against standard coin sizes (CR2032 is 20 mm in diameter, 3.2 mm thick; CR2025 is 20 mm, 2.5 mm thick; CR1616 is 16 mm, 1.6 mm thick).
What to do if you can’t read the size
Take the fob to the dealership, an automotive parts store, or a battery retailer. They can confirm the correct cell by model and ensure a proper fit without damaging the fob.
Step-by-step replacement guide
Once you know the right type, follow these steps to replace it safely.
- Identify the correct battery size (as described above).
- Open the key fob: release the switch or pry apart the two halves carefully, using a small flat tool if needed.
- Remove the old battery, noting its orientation (which side is facing up).
- Insert the new battery with the correct polarity (usually the plus side facing up).
- Reassemble the fob and press the buttons to confirm the remote functions work.
- Recycle the old battery properly at a recycling facility or retailer that accepts batteries.
In most cases, replacing the battery does not require reprogramming the fob. If the remote stops working after replacement, consult your manual or dealer for model-specific resync instructions, as procedures can vary by vehicle.
Summary
There isn’t a single battery that fits every 2011 key fob. The majority use a 3-volt coin cell such as CR2032, but CR2025, CR1616, and, in a minority of cases, A23 may also appear. Always verify the exact size for your vehicle by checking the manual or inspecting the fob, and follow model-specific replacement steps to ensure proper operation.