BMW 1 Series key battery
F40
2019–2024- Smart keyCR2032
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 CR2032 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.
F20/F21
2011–2019- Smart keyCR2450
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 CR2450 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.
E87 LCI (E87N)
2007–2011- Remote head keyVL2020
Not a battery you can swap. This key has a rechargeable cell soldered to the board, which charges while the key's in the car. A long drive can top up a weak one. If it won't hold a charge, an auto locksmith can replace the cell or the key.
- Smart keyCR2032
E87
2004–2011- Remote head keyCR2032
For locksmiths · F40
- KeysSmart key
- Tools confirmed6
- Transponder chipSubscribers
- Programming procedureSubscribers
Questions
BMW 1 Series key battery questions
F40 (2019–2024): CR2032 in the smart key. F20/F21 (2011–2019): CR2450 in the smart key. E87 LCI (2007–2011): VL2020 in the remote head key; CR2032 in the smart key. E87 (2004–2011): CR2032 in the remote head key.