Key Fob Batteries & Coin Cells

Shop key fob batteries, lithium coin cells, battery testers, and replacement tools for professional locksmith services. Noble Key Supply carries common 3-volt battery sizes for automotive remotes, proximity keys, smart keys, and other compatible electronic devices.

Available products include coin-cell batteries in packs of five, diagnostic testers, key-shell pry tools, and a portable battery for the Black Widow key machine.

Automotive Key Fob Batteries

Modern vehicle remotes and smart keys depend on compact batteries to transmit signals to the vehicle. A weak or depleted battery can reduce operating range, cause intermittent button response, or prevent keyless-entry functions from working.

Replacing the battery is often one of the first diagnostic steps when a remote or proximity key stops responding consistently. Locksmiths who stock multiple coin-cell sizes can complete these services quickly without waiting for additional supplies.

Common Lithium Coin-Battery Sizes

The collection includes several widely used 3-volt lithium coin-cell sizes:

• CR1616
• CR1620
• CR1632
• CR2016
• CR2025
• CR2032
• CR2430
• CR2450

Each size has different physical dimensions and is not automatically interchangeable with another battery. Verify the number printed on the original cell or consult reliable product information before installing a replacement.

CR2032 Key Fob Batteries

The CR2032 is one of the most common batteries used in automotive remotes and proximity keys. It measures approximately 20 millimeters in diameter and 3.2 millimeters thick.

A CR2032 should only replace another CR2032 unless the key manufacturer specifies an alternative. A thinner or thicker battery may fit incorrectly, lose contact, or place unnecessary pressure on the key housing.

CR2025 and CR2016 Coin Batteries

CR2025 and CR2016 batteries share a 20-millimeter diameter with the CR2032 but differ in thickness. These dimensional differences affect fit and electrical contact inside the key.

Do not select a replacement based only on diameter. Match the complete battery number to the original cell.

CR1616, CR1620, and CR1632 Batteries

Smaller key fobs and remotes may use a 16-millimeter coin cell. CR1616, CR1620, and CR1632 batteries have the same approximate diameter but different thicknesses.

Check the original battery carefully because these sizes can look nearly identical when viewed from above.

CR2430 and CR2450 Batteries

Larger smart keys and electronic devices may require CR2430 or CR2450 lithium coin batteries. These 24-millimeter cells provide the size and capacity required by their intended devices.

The CR2430 and CR2450 are not interchangeable simply because they have the same diameter. Always match the full model number.

Convenient Packs of Five

Coin batteries in this collection are sold in packs of five, making them convenient for locksmith shops, mobile technicians, dealerships, and automotive key-service providers.

Keeping multiple battery sizes on hand helps technicians handle a broader range of vehicles and avoid delays during remote and smart-key service calls.

Battery Shelf Life and Storage

The listed coin-cell batteries have a specified shelf life of up to five years when stored properly. Actual performance can be affected by storage temperature, humidity, packaging condition, and the age of the battery when installed.

For dependable inventory management:

• Keep batteries in their original packaging
• Store them in a cool, dry location
• Avoid excessive heat and direct sunlight
• Prevent loose batteries from contacting metal objects
• Rotate older inventory forward
• Inspect packaging before use

Always keep coin batteries away from children and pets. Coin-cell ingestion is a medical emergency requiring immediate professional assistance.

Signs of a Weak Key Fob Battery

A weak automotive key battery may cause:

• Reduced remote operating range
• Intermittent lock or unlock response
• Multiple button presses before activation
• Delayed remote-start operation
• A low-key-battery warning on the vehicle
• Inconsistent proximity detection
• Failure of passive-entry functions

These symptoms can also be caused by damaged buttons, worn contacts, faulty electronics, or vehicle-related problems. Testing the battery helps determine whether replacement is necessary.

Battery Testers for Locksmiths

A battery tester allows technicians to check the condition of a coin cell before replacing it. Testing can help distinguish a depleted battery from problems involving the key’s circuit board, button pad, or vehicle receiver.

A compact tester is useful for locksmith shops and mobile service vehicles that regularly diagnose automotive remotes and proximity keys.

Key-Shell Pry Tools

Key-shell pry tools help open compatible remotes and smart keys while reducing the risk of damaging their plastic cases. Using an appropriately sized tool provides better control than forcing the shell apart with an oversized screwdriver or other unsuitable object.

Before opening a key:

1. Remove the emergency blade when applicable
2. Locate the designated opening point
3. Use controlled pressure
4. Avoid contacting the circuit board
5. Note the battery’s orientation
6. Reassemble the case securely

Key designs vary, so follow the correct procedure for the specific remote or smart key.

Correct Battery Orientation

Coin-cell batteries have positive and negative sides. Installing a battery backward can prevent the key from operating and may damage sensitive electronics in some devices.

Observe the original battery’s orientation before removing it. The positive side is typically marked with the battery number and a plus symbol, but placement inside the key differs by design.

Portable Battery for the Black Widow Key Machine

The collection also includes a 22,000mAh, 12-volt portable battery designed to power a compatible Black Widow key machine. This portable power option can support mobile key-cutting work where access to a standard outlet is limited.

Review the complete product description before ordering. The required EC5-F connection cable is not included with the portable battery unless otherwise stated.

Choosing the Correct Battery

Before purchasing or installing a replacement, verify:

1. The complete battery number
2. Voltage
3. Diameter and thickness
4. Positive and negative orientation
5. Key-fob or device compatibility
6. Package quantity
7. Product condition and packaging
8. Whether additional tools are needed

Matching the battery specifications helps ensure proper fit, dependable contact, and consistent operation.

Shop Batteries and Battery Tools at Noble Key Supply

Browse lithium coin batteries for automotive remotes, proximity keys, and smart keys, along with battery testers and key-shell pry tools. Noble Key Supply helps locksmiths maintain the dependable battery inventory and service tools needed for everyday automotive key work.