Is your 2011 Mini Cooper displaying a low key fob battery warning? Don’t rush to the dealership for an expensive replacement. While BMW/Mini might suggest the key fob is sealed and irreplaceable, it’s entirely possible to perform a 2011 Mini Key Fob Battery Replacement yourself with a bit of careful DIY work. This guide will walk you through the process step-by-step, saving you money and keeping your Mini key in top shape.
You might have seen this warning light appear on your Mini Cooper’s dashboard, signaling a low battery in your key fob.
Like many modern car keys, the 2011 Mini key fob uses a rechargeable battery that charges inductively when inserted into the dashboard slot. However, over time, these batteries degrade and need replacing. If your Mini doesn’t have the comfort access package, your key fob will likely be the sealed type, meaning there’s no easy access to the battery compartment.
Don’t be intimidated by the “sealed” design. With the right tools and a steady hand, you can successfully open your 2011 Mini key fob and perform a battery replacement. This guide provides a detailed walkthrough to help you complete this task.
This is what the standard 2011 Mini Cooper key fob looks like:
In emergencies, remember that your Mini key fob contains a mechanical key. This can be removed to manually unlock and start your car if the battery is completely dead.
Tools and Materials You’ll Need for a 2011 Mini Key Fob Battery Replacement
Before you begin, gather these tools and materials:
- Small, sharp knife or precision blade: For carefully separating the key fob casing.
- Small flat-head screwdriver or plastic pry tool: To assist in opening the case.
- Soldering iron and solder: For desoldering and resoldering the battery.
- Replacement battery: Panasonic VL2020-1HFN rechargeable battery (ensure the clips are correctly oriented).
- Multimeter (optional but recommended): To check battery polarity.
- Plastic glue or epoxy: To reassemble the key fob casing.
- Clamps or rubber bands: To hold the casing together while the glue dries.
- Dremel or small files (optional): For refining the chrome ring if damaged during disassembly.
- Electro cleaner (optional): To clean the micro-switches.
Step-by-Step Guide to Replacing Your 2011 Mini Key Fob Battery
Step 1: Removing the Chrome Ring
The first step is to remove the chrome ring surrounding the key fob. This ring is fragile and can break easily, so proceed with caution. Gently pry around the edges with a small flat-head screwdriver or plastic pry tool.
Step 2: Opening the Key Fob Casing
This is the most delicate part of the process. The key fob casing is glued together and needs to be carefully separated. Using a sharp knife or precision blade, carefully cut along the seam of the key fob. Work slowly and patiently, going around the entire circumference multiple times, gradually deepening the cut. A vise with wood blocks can help stabilize the key fob and provide a safe cutting surface.
Once you’ve cut deep enough around the entire seam, gently pry the two halves of the key fob casing apart.
Step 3: Accessing the Circuit Board and Battery
The internal circuit board should now be accessible. In most cases, it will lift out easily from the casing.
Step 4: Desoldering the Old Battery
Carefully locate the battery on the circuit board. It’s typically a Panasonic VL2020-1HFN rechargeable battery. Use a soldering iron to desolder the old battery from the circuit board. Take note of the battery’s orientation (+ and – terminals) before removal.
Here’s a closer look at the removed battery:
Step 5: Examining the Circuit Board
While the circuit board is exposed, take a moment to inspect the micro-switches. These can sometimes wear out. You can clean them with an electro cleaner if desired. Note the coil on the back of the board, which is part of the inductive charging system.
Important Note: When working with electronic components, be mindful of electrostatic discharge (ESD). While key fobs are relatively robust, taking precautions like using an ESD workstation and wrist strap is best practice in sensitive environments. For this DIY task, being generally careful is usually sufficient.
Step 6: Soldering the New Battery
Obtain a new Panasonic VL2020-1HFN battery with the correct clip orientation. Double-check the polarity and carefully solder the new battery onto the circuit board in the correct orientation. Ensure the battery sits at the correct height for proper casing closure.
Caution: Ensure you solder the battery on the correct side of the circuit board and with the correct polarity. Mistakes can happen!
Step 7: Reassembling the Key Fob
Carefully place the circuit board back into one half of the key fob casing. Test the mechanical key mechanism to ensure it functions correctly before fully closing the case.
Apply plastic glue or epoxy to the edges of the casing halves and carefully press them together. Clamp or use rubber bands to hold the casing firmly while the glue dries completely (usually 24 hours).
Step 8: Refitting the Chrome Ring
Refitting the chrome ring can be tricky, especially if it was damaged during removal. You may need to use a Dremel or small files to reshape the key fob body for proper alignment. Carefully press the chrome ring back into place.
Step 9: Final Testing
Once everything is reassembled, test your 2011 Mini key fob. The low battery warning should be gone, and your key fob should function correctly.
Conclusion
Replacing the battery in your 2011 Mini key fob is a manageable DIY task that can save you a significant amount compared to dealership prices. By following these steps carefully and taking your time, you can successfully complete this 2011 Mini key fob battery replacement and restore your key fob to full working order. Remember to always double-check battery polarity and orientation during soldering for optimal performance. Happy DIY-ing!
