In most cases, a 2010-era key fob uses a CR2032 battery, but some models use CR2025 or even smaller coin cells like CR2016/CR1616. The exact size depends on the vehicle’s make and model, so verify the correct battery for your specific fob.
Common battery sizes found in 2010-era key fobs
Here is a quick guide to the coin-cell sizes most likely to appear in key fobs from that period.
- CR2032 — 3-volt lithium coin cell; by far the most common for car remotes from this era.
- CR2025 — a thinner 3-volt coin cell used in some models with slimmer fob shells.
- CR1616 or CR2016 — smaller diameter coin cells used in a minority of compact remotes.
In practice, CR2032 covers the majority of 2010 models, with CR2025 or smaller variants appearing in a subset tied to specific manufacturers or fob designs.
How to confirm the exact battery for your fob
To ensure you’re using the correct battery for your specific vehicle, check these sources and clues.
Manufacturer-specific notes
- Owner’s manual or the vehicle’s documentation often lists the recommended fob battery type.
- Open the fob and inspect the old battery for its size imprint (for example "CR2032").
- Note your vehicle’s make, model, and year and consult the manufacturer’s site or a parts retailer by searching “fob battery for [year, make, model].”
When in doubt, contact a dealership or a professional locksmith for precise guidance, especially if you’re replacing a dealership-issued smart key.
How to replace a 2010 key fob battery
Follow these steps to replace the battery safely and effectively. If your fob isn’t opening easily, don’t force it; some use a hidden seam or a small slot.
- Separate the two halves of the fob using a small flat-head screwdriver or a dedicated key blade; remove the mechanical key if present.
- Carefully lift out the old battery and set it aside for proper disposal.
- Insert the new battery with the correct polarity. For most CR2032s, the positive (+) side faces upward; confirm by checking the replacement’s labeling or the fob’s battery cavity.
- Reassemble the fob halves and reattach any mechanical key; ensure the cover snaps securely into place.
- Test the fob by pressing the lock/unlock and starting the vehicle if compatible. If the fob still doesn’t respond, the issue may involve the circuit or programming rather than the battery.
Once replaced, keep the fob away from extreme heat or moisture and dispose of the used battery at a proper recycling location.
Summary
For a 2010 key fob, CR2032 is the most common battery type, with CR2025 or other smaller coin cells used in a minority of models. Always verify by inspecting the current battery, checking the owner’s manual, or consulting the manufacturer or dealer. This approach ensures you replace the correct coin cell and keep your remote functioning reliably.