The car battery key fob is a crucial component of modern vehicle security and convenience, allowing drivers to remotely unlock, lock, and even start their vehicles with the press of a button. At the heart of this technology is a small, yet powerful, coin cell battery that powers the key fob’s wireless communication and other features.
Understanding the Car Battery Key Fob
The car battery key fob typically uses a CR2032 coin cell battery, which has a nominal voltage of 3 volts. This type of battery is widely available and relatively inexpensive, making it a common choice for key fob manufacturers.
Battery Life Expectancy
The battery life of a car key fob can vary significantly, depending on factors such as usage patterns, environmental conditions, and the specific design of the key fob. According to user reports, some key fob batteries can last as long as 15-18 months before needing replacement, while others may only last 6-12 months.
One user on the Maxima Forums reported that after 15 months of use, the battery voltage in their key fob was measured at 3.03V using a Sperry DM-350A multimeter. Another user on the r/VWiD4Owners subreddit mentioned that their wife’s key fob battery lasted for an extended period, further highlighting the variability in battery life.
Wireless Feature Inoperability
When the key fob battery is depleted, the wireless features of the key fob, such as remote locking and unlocking, become inoperable. However, the key fob can still be used to start the car by placing it in the designated dash holder, which allows the car’s systems to read the RFID tag embedded within the fob, bypassing the need for battery power.
Mechanical Key Backup
In the event that the key fob battery dies or the key fob is lost, it is possible to create a duplicate mechanical key that can be used to open the car and access the trunk. This mechanical key can be hidden in a secret location on the outside of the car, providing a backup option for starting the vehicle and retrieving the key fob.
Replacing the Key Fob Battery
When the time comes to replace the key fob battery, it is essential to use the correct battery size, which is typically a CR2032 coin cell battery. This battery can be found in most retail locations, including hardware stores, electronics shops, and even some grocery stores.
Tools Needed
To replace the key fob battery, you will need the following tools:
- A thin blade or small screwdriver to pry open the key fob housing
- A precision screwdriver to remove any screws or fasteners
- Tweezers to handle the small battery
Replacement Process
- Locate the battery compartment on the key fob, which is usually accessible by gently prying open the housing.
- Use the thin blade or small screwdriver to carefully open the key fob housing, taking care not to damage any internal components.
- Locate the old battery and use the tweezers to remove it.
- Insert the new CR2032 coin cell battery, ensuring that the positive (+) side is facing up.
- Carefully close the key fob housing, ensuring that all the components are properly aligned and secured.
Precautions
When replacing the key fob battery, it is important to take the following precautions:
- Avoid touching the battery terminals with your bare hands, as the oils from your skin can cause corrosion over time.
- Ensure that the new battery is the correct size and voltage (CR2032, 3V) to avoid any compatibility issues.
- Dispose of the old battery properly, as coin cell batteries contain small amounts of hazardous materials.
Conclusion
The car battery key fob is a vital component of modern vehicle technology, providing drivers with convenient remote access and control. Understanding the key fob’s battery requirements, replacement process, and backup options can help ensure that you never find yourself stranded due to a dead key fob battery.
References
- Maxima Forums – Key FOB battery
- YouTube – Measure Your Car Key Fob Battery with a Multimeter (Easy!)
- eevblog.com – Lithium coin battery voltage check before replacing it
- Interstate Batteries – The Real Trick to Installing Key Fob Replacement Batteries
- Reddit – r/VWiD4Owners – Need to change battery in key fob regularly
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