JONPARTS guides
How-to
Ford Key Battery Replacement: Fiesta, Focus, Puma and Kuga (2026)
Which battery your Ford key takes, how to open a flip key or keyless fob without snapping a clip, and how to start the car if the key is dead.
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Mercedes Key Battery Change: Chrome Arrow Key, Flat Key and AMG, Step by Step
The chrome arrow key takes two CR2025, the flat key takes one CR2032. How to open each Mercedes key without damaging the chrome, and how to start the car when the key is dead.
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BMW Key Battery Replacement: F-Series, G-Series and Display Key, Step by Step
Every BMW key since 2012 takes a CR2032. How to open the F-Series and G-Series key without breaking the clips, how to charge the Display Key, and how to start the car when the key is dead.
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Car Key Battery Replacement: Which Battery Every Key Takes and How to Change It (2026)
Which battery your car key takes (CR2032, CR2025, CR2430, CR1632) by brand, how to open each key without breaking it, and how to start the car if the key is already dead.
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How to Remove a Mercedes Key Fob Cover Without Breaking It
Two different jobs hide behind this question: taking off a protective cover, and opening the key itself to change the battery. Here is how to do each without snapping anything.
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