Mercedes-Benz SLK key battery
Every Mercedes-Benz SLK remote key we cover, 2004–2011, takes 2 × CR2025.
R171
2004–2011- Remote head key2 × CR2025
Takes two cells. Replace both at the same time, stacked the same way as the old ones.
How to change a remote head key battery
- Look for a small screw or a slot along the seam of the plastic head. Undo the screw if there is one.
- Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot and twist gently to part the head. Keep it off the circuit board and contacts.
- Note which way up the old cell sits before you lift it out. It varies by key, so don't assume + is up.
- Fit a new 2 × CR2025 the same way up, holding it by the edges. Leave any grease on the contacts.
- Clip the case back together and test the buttons at the car. Most keys work straight away with no reprogramming.
- Keep new and old cells away from children. A swallowed button battery can cause serious injury within two hours.
For locksmiths · R171
- KeysRemote head key
- Tools confirmed26
- Transponder chipSubscribers
- Programming procedureSubscribers
Questions
Mercedes-Benz SLK key battery questions
R171 (2004–2011): 2 × CR2025 in the remote head key.