Changing a remote car key battery is a straightforward DIY task that typically takes just a few minutes. The core steps involve prying the key fob open, identifying the old battery, replacing it with the correct new one, and reassembling the unit. The most critical details are using the right battery type and handling the components carefully to avoid damage.
The first step is to open the key fob. Most key fobs have a small seam. Look for a tiny notch or slot where you can insert a flat-head screwdriver or a coin. Some models might have a hidden release button or a small screw. Apply gentle, even pressure to pop the case apart. Avoid using excessive force to prevent breaking the plastic tabs holding it together.
Once open, you'll see the circuit board and the battery. The battery is usually a small, round, flat cell. Take a moment to note the battery type before removing it. Common battery numbers include CR2032, CR2025, and CR2016. The number is printed on the battery's face. Using the wrong type can lead to poor performance or damage.
To remove the old battery, it may be held in place by a small metal clip. Gently push or slide the clip aside to release the battery. You can use a non-metallic tool, like a plastic spudger or a toothpick, to pop it out. Handle the new battery by the edges to avoid transferring skin oils to the contacts, which can affect performance.
Place the new battery into the slot with the correct side facing up. The positive side (+) is almost always facing up, but double-check the markings inside the fob. Press it down until it clicks into place. Before snapping the two halves of the key fob back together, test the buttons to ensure the new battery is working. Finally, press the halves together firmly until you hear a click.
Here is a quick reference for common battery types by vehicle make:
| Vehicle Make | Typical Battery Type | Average Battery Life |
|---|
| Toyota/Lexus | CR2032 | 2-4 years |
| Honda/Acura | CR2032 | 3-5 years |
| Ford/Lincoln | CR2032 | 2-3 years |
| Chevrolet/GMC | CR2032 or CR2025 | 2-4 years |
| BMW | CR2032 | 1-3 years |
| Mercedes-Benz | CR2025 | 3-4 years |
| Nissan/Infiniti | CR2025 | 2-3 years |
| Hyundai/Kia | CR2032 | 3-5 years |
