In the intricate workings of modern vehicles, car key fobs play a pivotal role in unlocking and starting the engine. These compact devices rely on batteries to transmit signals to the vehicle’s receiver, enabling keyless entry and ignition. However, with time, the battery in a car key fob will inevitably deplete, requiring a replacement. Choosing the right battery size is crucial to ensure optimal performance and prevent potential issues.
Understanding Battery Size for Car Key Fobs
The size of the battery used in a car key fob is typically indicated by its dimensions in millimeters. The most common battery sizes used in these devices are CR2032 and CR2025.
CR2032 Battery
– Dimensions: 20mm (diameter) x 3.2mm (thickness)
– Commonly used in older key fobs and some newer models from Toyota, Lexus, and Scion.
– Offers a longer lifespan compared to other sizes.
CR2025 Battery
– Dimensions: 20mm (diameter) x 2.5mm (thickness)
– Widely used in modern key fobs from manufacturers like Honda, Hyundai, Ford, and Chevrolet.
– Provides a compact and lightweight power source.
## What Size Battery For Car Key Fob
Your car key fob, also known as a remote keyless entry (RKE) fob, plays a crucial role in modern vehicles by allowing you to unlock and start your car without physical contact with the ignition. These key fobs rely on batteries to operate, and knowing the right battery size is essential for replacing the old one.
### Types of Batteries for Car Key Fobs (See Also: Which Optima Battery Is Best For Car Audio)
- **Lithium batteries:** Most car key fobs use lithium batteries, specifically lithium manganese dioxide (Li-MnO2).
- **Coin cell batteries:** These batteries are typically smaller and are often used in older key fobs.
- **Custom-made batteries:** Some manufacturers create specific batteries designed for certain key fob models.
### Determining the Right Battery Size
The correct battery size for your car key fob can be found on the following:
- Your car’s owner’s manual
- The manufacturer’s website
- A local automotive parts store
### Common Battery Sizes for Car Key Fobs
| Battery Size | Common Applications |
|---|---|
| CR2032 | Most modern key fobs, including Toyota, Honda, Ford, and Chevrolet |
| CR2025 | Older key fobs and some luxury brands like Mercedes and BMW |
| AG13 | Some key fobs from Toyota and Lexus |
### How to Replace the Battery
Replacing the battery in your car key fob is a relatively simple process. You will need:
- A new battery of the correct size
- A pair of tweezers or needle-nose pliers
1. Locate the battery compartment in the key fob.
2. Use tweezers or pliers to gently pry open the battery compartment.
3. Remove the old battery and insert the new battery.
4. Close the battery compartment securely. (See Also: What Does Reserve Capacity Mean On A Car Battery)
### Key Points
– The correct battery size for your car key fob can be found in the owner’s manual, manufacturer’s website, or an automotive parts store.
– Most car key fobs use lithium manganese dioxide (Li-MnO2) batteries.
– Replacing the battery in a key fob is a simple process that can be done at home.
##
What Size Battery For Car Key Fob?
What is the most common battery size for car key fobs?
The most commonly used battery size for car key fobs is CR2032.
What are the other common battery sizes for car key fobs?
Other common battery sizes for car key fobs include CR1632 and AG13. (See Also: Does Car Click When Battery Is Dead)
How do I know what size battery I need for my car key fob?
Check the owner’s manual for your car or consult a reputable auto parts store for assistance.
Where can I find replacement batteries for car key fobs?
Replacement batteries can be found at most major retailers such as auto parts stores, convenience stores, and online retailers.
How do I know if the battery in my car key fob is dead?
If your key fob is not functioning properly, such as slow response time or no response at all, the battery may be dead and needs to be replaced.
