What battery does my key fob take?
Most key fobs use a 3 V lithium coin cell such as a CR2032, CR2025, CR2016, CR1620 or CR2450, but it varies by vehicle and model year.[1 · Oct 29, 2026][2 · Oct 29, 2026] The size is printed on the old battery and listed in your owner's manual.[2 · Oct 29, 2026]
How to find your fob's battery
- Look at the old battery. Ford says the battery type is printed on the battery itself and in the owner's manual.[2 · Oct 29, 2026]
- Check the manual's key or remote section. Honda's 2024 CR-V manual, for example, lists a CR2032 for its keyless remote.[3 · Oct 29, 2026]
- Use the code. Type it into the battery finder to see the size, voltage and other names.
Before you open it
- Some fobs don't have a replaceable battery. Ford notes that some of its keys have a sealed rechargeable battery.[2 · Oct 29, 2026]
- Ford says changing the battery doesn't erase the key's programming.[2 · Oct 29, 2026]
- Honda's manual warns of a chemical burn hazard from the coin battery and says to dispose of used batteries according to local regulations.[3 · Oct 29, 2026]
- CR2032 and CR2025 have the same diameter but different thicknesses.[4 · Oct 29, 2026][5 · Oct 29, 2026] Buy the exact size. See CR2032 vs CR2025 vs CR2016.
Keep spare coin cells safe
A swallowed coin cell can cause serious injury or death in as little as 2 hours.[4 · Oct 29, 2026] Keep spares in their packaging, out of children's reach. The EPA says used coin cells shouldn't go in the trash; tape or bag them for a battery recycler.[6 · Oct 29, 2026]
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Sources: 1. Energizer, Battery cross reference guide (PDF, 2021). 2. Ford UK, How to replace the Ford key fob battery. 3. Honda, 2024 CR-V owner's manual: replacing the keyless remote battery. 4. Energizer CR2032 lithium coin datasheet (PDF). 5. Energizer CR2025 lithium coin datasheet (PDF). 6. US EPA, Used household batteries. Checked Oct 29, 2026. Inch conversions are our own arithmetic from the millimeter figures. Brand names and trademarks belong to their owners; specs are restated in our own words and tables, not reproduced.