What battery does a Mercedes-Benz ML key take?

Mercedes-Benz ML key battery

Every Mercedes-Benz ML remote key we cover, 2005–2011, takes 2 × CR2025.

2005–2011

Remote head key2 × CR2025
Takes two cells. Replace both at the same time, stacked the same way as the old ones.
Smart 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.

How to change a smart key battery

Slide the release catch and pull out the emergency key blade.
Wrap the tip of a small flat screwdriver in tape or a cloth, put it in the slot the blade leaves and twist gently to part the case. 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.

Questions

W164 (2005–2011): 2 × CR2025 in the remote head key and smart key.