what size battery for key fob
Most modern key fobs use a small 3V coin (button) cell battery, and the most common size is CR2032, but the exact size depends on your car’s make, model, and year.
Quick Scoop: What size battery for a key fob?
For most people, the answer is:
- The most common key fob battery is a 3V CR2032 coin cell.
- Some cars use other 3V coin cells like CR2016, CR1632, CR1616, CR2450, CR2430 , etc.
- Certain models (for example some Honda CR‑V years) use less common sizes like CR1250.
Because of this variety, you should always confirm the exact size before buying.
How to find the exact battery size
Use one (or more) of these methods:
- Check the key fob itself
- Many fobs have the battery type molded or printed on the plastic case, on the back, or inside once opened (e.g., “CR2032 3V”).
* Look closely with good lighting; the text can be very small.
- Look at the old battery
- Open the fob carefully and read the markings on the existing coin cell (e.g., “CR2032”, “CR2016”).
* Match both the code (CR2032) and **3V** rating when you buy a replacement.
- Use vehicle-specific guides
- Many online tools and brand charts let you enter your make, model, and year and tell you the exact fob battery.
* These are handy if you’re shopping before opening the fob.
Common key fob battery types (at a glance)
| Battery code | Type / voltage | How often used in key fobs? |
|---|---|---|
| CR2032 | 3V lithium coin cell | Very common; used in many Ford, Hyundai, Jeep, Chevy, Cadillac, GMC, VW and others. | [7][3][5][1]
| CR2016 | 3V lithium coin cell | Also common; used in some Toyota and other brands. | [5]
| CR1632 / CR1616 | 3V lithium coin cells | Used in various compact fobs; highlighted in recent key fob battery guides. | [4][6]
| CR2450 / CR2430 | 3V lithium coin cells | Used in larger or higher‑capacity fobs; less common than CR2032. | [6][5]
| Special sizes (e.g., CR1250) | 3V lithium coin cell | Used in specific models like some Honda CR‑V key fobs. | [1]
Signs you need a new battery
- You have to press buttons multiple times or from very close range.
- The LED on the fob is dim or not lighting.
- Your car shows a “keyless remote battery low” warning.
If you’re experiencing these, it’s time to replace the battery with the confirmed size for your fob.
Simple replacement tips
- Use a small flat tool (like a thin screwdriver or watch knife) to gently pry the case open at the seam.
- Take a quick photo of the battery before removing it so you remember the orientation (which side faces up).
- Avoid bending contacts; insert the new 3V coin cell in the same position and snap the case back together.
- Recycle the old battery at an electronics or battery recycling point—billions of batteries are thrown away yearly, and proper recycling helps reduce waste.
Bottom note: Information gathered from public forums or data available on the internet and portrayed here.