How to Replace the Battery in a Mercedes-Benz B180 Key?

[Tim]

Mercedes-Benz B180 key battery replacement method is: 1. Remove the mechanical key from the smart key, the smart key is the L-shaped key; 2. Carefully observe the top of the smart key, use this L-shaped key to pierce through the shallow groove of the smart key and push it all the way down, you will notice that the back cover of the smart key will automatically pop out; 3. Remove the old battery, then install the new battery, and reassemble the back cover and mechanical key. The Mercedes-Benz B180 is a compact car with a maximum engine power of 100 kW and a maximum torque of 200 Nm. The front suspension of the car uses a MacPherson independent suspension, the rear suspension uses a torsion beam non-independent suspension, and the drive mode is front-wheel drive.

[VonElla]

My Mercedes B180 key fob battery died, but replacing it is quite simple. Just prepare a CR2025 coin cell battery. Use a coin or a thin tool to press into the groove on the back of the key fob and gently pry it open. Carefully remove the old battery, paying attention to the positive/negative orientation. Align the new battery perfectly when inserting it. You'll know the cover is properly secured when you hear a 'click' sound. The whole process takes just three minutes. I tested it by pressing the unlock button—the red light came on, confirming success. Remember to keep the key away from strong magnetic fields like induction cooktops, as this drains the battery faster. The veteran mechanic in the workshop mentioned these car keys are particularly sensitive to drops, so it's best to handle them on a soft surface during battery replacement.

[SimonLynn]

Last time I replaced the battery for my Mercedes B180 key, I noticed a few key points. You'll need a small flathead screwdriver to gently twist open the casing at the side slot of the key. The battery is a standard CR2025, which can be easily found at supermarket counters. When installing the new battery, make sure the positive side faces outward and properly contacts the key's spring plate. After installation, test the remote start function several times to check responsiveness - if there's lag, the contacts might be dirty and need cleaning with alcohol swabs. These smart keys with keyless entry systems are particularly power-hungry, so I check the voltage of my spare key monthly. Old Zhang from the car club recommends proactively replacing the battery every two years to avoid the embarrassment of getting locked out.

[PiperMarie]

Experience from replacing Mercedes key fob batteries three times. Pinch the metal strips on both sides and give a firm pull, the back cover pops open easier than using tools. Remember the battery model CR2025 – don't get it wrong. The slightly smaller 2023 model can fit but won't last long. Wear gloves during installation as fingerprint grease can corrode the contacts. Once I accidentally triggered the emergency locator signal; after battery replacement, hold the lock button for 10 seconds to reset the system. A dealership mechanic reminded me that winter cold accelerates battery drain – below freezing, it's best to keep the key close to your body. The smart key's induction zone also easily interferes with cellphones when placed together.