How to Replace the MG HS / MG ZS (2019-2023) Key Fob Battery

If you own an MG HS or MG ZS built between 2019 and 2023, sooner or later you’ll need to replace the key fob battery. It’s a simple and inexpensive task that you can do yourself in just a few minutes. In this guide, we’ll walk you through the process, the tools you’ll need, and tips to make sure your key fob works flawlessly afterward.

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Why and When to Replace the Battery

Signs That the Battery Is Running Low

• The key fob doesn’t open or lock the car consistently.
• You have to press the buttons multiple times for them to work.
• The remote range decreases noticeably.
• Your vehicle may show a “replace the smart key battery” message.

Consequences of Not Replacing It

If the battery dies completely, the key fob will stop working and you’ll lose the convenience of remote access and ignition. Although there’s an emergency key inside the fob, it’s much less convenient, and you might need dealership assistance if the issue persists.

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What Battery Does the MG HS/ZS Key Fob Use?

Battery Type

Both MG HS and MG ZS models use a CR2032 lithium coin-cell battery (3 V). It’s one of the most common batteries available and can be purchased from supermarkets, electronic stores, or online.

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Buying Precautions

• Choose a reliable, high-quality brand.
• Confirm that it’s new and unused.
• Make sure it’s the correct model: CR2032 (3 V).
• Avoid old stock or batteries exposed to heat.

Step-by-Step Battery Replacement

Tools You’ll Need

You don’t need any special tools. The emergency key built into the fob is enough. Alternatively, a small flat-head screwdriver can also help.

Step 1: Release the Emergency Key

• Find the button on the side of the key fob.
• Press it to release the metal emergency key.
• Pull the key out completely from the slot.

Step 2: Open the Battery Compartment

• Use the tip of the emergency key (or a small screwdriver) to gently pry the battery cover upward.
• Once the cover pops up, lift it off carefully.
• Remove the old battery.

Step 3: Insert the New Battery

• Place the new CR2032 battery into the slot with the “+” side facing up.
• Ensure it sits correctly in its position — you should feel it click into place.
• Gently press it down so it’s fully secured.

Step 4: Reassemble the Key Fob

• Snap the battery cover back into place.
• Insert the emergency key back into its holder and slide it until it clicks.
• Press the side button again to make sure it locks properly.

Step 5: Test the Fob

• Try locking and unlocking your car.
• Check that the range is restored and all buttons respond normally.
• If your model supports remote start or tailgate release, verify those too.

Extra Tips and Best Practices

Avoid Damaging the Fob

• Don’t use excessive force or sharp metal tools when opening it.
• Avoid touching the battery contacts with your fingers.
• Always handle the fob with clean, dry hands.
• Dispose of the used battery properly at a recycling point.

If the Fob Still Doesn’t Work

• Check the battery orientation again.
• Make sure it’s fully pressed into place.
• Clean any visible dust or corrosion from the contacts.
• Try re-synchronizing the key with the car if necessary.
• If it continues to fail, consult an authorized MG dealer — the problem might be in the key’s circuit or receiver module.

Quick Reference Table

Conclusion

Replacing the key fob battery in your MG HS or MG ZS is quick, cheap, and straightforward. With a new CR2032 battery and a few simple steps, your key will work like new again. Take your time, follow the instructions carefully, and enjoy the convenience of a fully functional remote control.

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