The most common battery for 2018 key fobs is the CR2032 3V coin cell, though some models use CR2025 or CR2016; always check your manual to confirm.
In practice, many key fobs from that era rely on a small 3-volt coin cell, but the exact size can vary by make and model. Replacing the battery is typically straightforward, but the correct size must be used to ensure proper fit and function. This guide covers the typical sizes you’ll encounter, how to identify the right one for your vehicle, and how to replace it safely.
Common coin-cell sizes used in 2018-era key fobs
The following battery sizes are the ones you’re most likely to encounter in a 2018 vehicle’s key fob. Before replacing, confirm that your specific fob uses one of these sizes.
- CR2032 — 3V lithium coin cell; the standard choice for many modern car remotes, offering solid capacity and long life.
- CR2025 — 3V coin cell; thinner than CR2032 and used in some more compact remotes where space is limited.
- CR2016 — 3V coin cell; even thinner, used in a minority of smaller fobs.
Note: Some manufacturers may use other battery sizes or non-coin formats in rare cases. Verify your exact model’s requirements by checking the owner’s manual or inspecting the battery currently in the fob before purchasing a replacement.
How to identify the right battery and replace it
Follow these practical steps to identify the correct battery size and replace it correctly without damaging the fob.
- Open the fob according to the manufacturer’s instructions (some use a seam, others require a small screw).
- Remove the old battery and note its orientation (which side is facing up).
- Insert the new battery in the same orientation, ensuring it sits flat and contacts are clean.
- Reassemble the fob and test the remote by pressing a button to confirm it works from normal use distance.
- Dispose of the old battery at a recycling point or retailer that accepts batteries for recycling.
Selecting the correct size and installing it with the proper polarity helps prevent future issues such as weak remote range or failure to respond. If you’re unsure, consult the dealership, the vehicle’s manual, or a professional key-service provider.
Summary
For most 2018 key fobs, the go-to battery is a 3V coin cell, with CR2032 as the default. Others may use CR2025 or CR2016 depending on the remote’s size and design. Always verify the exact size from the owner’s manual or by inspecting the current battery, and replace it carefully to restore full remote functionality.