How to Replace the Key Battery for Mercedes-Benz G?
3 Answers
Mercedes-Benz G key battery replacement steps are as follows: 1. Before replacement, it is best to first understand the model of your car key battery. This information is usually available in the vehicle's user manual, and then select a new key battery according to the specified model. 2. From the tail of the key, push up the marked switch, and the hidden mechanical key will pop out slightly, then you can take out the mechanical key. 3. Still at the tail of the key, use the just removed mechanical key to press against the marked position, apply a little force, and the key shell can be opened. 4. After the key shell is removed, you can see that the battery position is relatively deep. Use a screwdriver to slide into the gaps on both sides, gently pry to remove the old battery. 5. Install the new battery, paying attention not to reverse the positive and negative poles. 6. Insert the top of the shell first, then press the other end firmly to complete the battery replacement.
I enjoy maintaining my car myself, and replacing the battery in a Mercedes G key is actually quite simple. First, you need to identify the correct key type—usually, the Mercedes G comes with a smart key featuring a sliding cover. Gently pry open the cover from the side using your fingernail or a small tool to reveal the CR2032 coin cell inside. Remember to remove the old battery first, and be careful not to reverse the polarity—insert the new battery with the positive side facing up. When reassembling, press the cover firmly to avoid any looseness. I once nearly damaged the key casing by applying too much force, so it’s best to handle it gently. After replacement, immediately test the unlocking and ignition functions to ensure everything works properly. By the way, it’s a good idea to regularly check the battery life, as the Mercedes app can also alert you to low battery levels. Overall, DIYing this can save you a few dozen bucks compared to visiting the dealership, and the whole process takes just five minutes.
As someone who often helps friends with car repairs, I recommend preparing some tools before replacing the battery in a Mercedes G key, such as a flathead screwdriver or plastic pry bar. First, confirm the reason for the key's power loss instead of rushing to take action. Place the key on a clean surface, locate the clips on the side or back, and carefully pry open the plastic cover without scratching the surface with metal tools. The battery inside is most likely a CR2032, which can be bought for a few dollars at a supermarket or online. Wear gloves when removing the old battery to avoid electric shock, and align the new battery properly in its slot. After securing the cover, press the buttons several times to test the locking and starting response. If it still doesn't work after replacement, the key might be damaged or require resetting, in which case professional repair is needed. For routine maintenance, it's advisable to replace the battery every two years to avoid malfunctions during long trips.
