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The VW Golf Mk7 key fob is powered by a CR2025 battery, with the numbers indicating the size in width and depth, measured in millimeters. It typically lasts for 2 to 4 years. When it's time to replace the battery, you can do so in just a few minutes by following these steps: Remove the key and gently open the fob using a flat tool like a butter knife or screwdriver. Swap out the old battery with a new one, making sure the positive side faces up. Put the back cover back on, and your key fob should work as good as new.
The battery type you need for the key fob of a VW Golf MK7 is CR2032.
I own a mk7.5 with a CR2025 battery. To remove the key, press the button and there will be a space where the key is placed when closed. Open the cover by lifting it up (it's pretty simple). Remember to replace the old battery with a new one right away to avoid reprogramming. If you wait too long, you may have to reprogram the key.
In 2017, my Golf 7.5 requires a CR 2025 battery for its key fob; a CR 2032 battery is not compatible with it.