How to Replace the Battery in a Mercedes-Benz GLA200 Key?

[OGabriela]

Here is the method to replace the battery in a Mercedes-Benz GLA200 key: 1. Pull up the key while pushing open the latch, then remove the key. 2. Insert the key to pop open the back cover. 3. After opening the key shell, you will find the battery positioned quite deep. Use any tool to slide into the gap on either side and gently pry to remove the old battery. 4. After inserting the new battery, first insert the top of the shell, then press firmly on the other end to complete the battery replacement. Below are precautions for using car keys: 1. Do not randomly move or touch any components inside the key to avoid affecting its normal operation. 2. Maintain a dry environment and avoid changing the battery with wet hands, as moisture can cause unexpected rusting of the battery.

[LeEthan]

I remember helping my wife replace the battery in her Mercedes GLA200 key fob not long ago, and it was actually quite simple. First, check if your key is the folding type—the GLA200 usually has a button-style electronic key. Use a small tool like a tiny screwdriver or a coin to locate the small notch on the back of the key, then gently pry it open. Inside, you’ll typically find a CR2025 coin battery. Pay attention to the orientation of the old battery’s positive and negative terminals to avoid installing the new one backward. Press the new battery firmly into place, then snap the key fob’s shell back together until you hear a click. The whole process takes about a minute, but be careful not to use too much force with the tool to avoid scratching the plastic casing. After replacing the battery, I usually press the key buttons a few times to test functionality—if it unlocks the car, you’re good to go. The battery usually lasts about two years, and keeping the key clean, avoiding drops, and preventing water exposure can help extend its lifespan.