Q: Z4 E89 key fob battery replacement

[AleNod]

I have two of the rechargeable key fobs, one is fine, the other the battery has stopped taking a charge due to lack of use. It does start the car okay though, its just I cant hold the button and open the roof on the fob.

I remember seeing a drawing somewhere, I think the battery is standard, but I seem to recall it is piggy backed on a little metal frame inside the housing.

I decided to ask BMW if the battery could be replaced, they said no, and gave me this nugget for a replacement fob complete:

There are various security procedures in place if you did want to order a new key, which would involve you bringing the car into your local BMW retailer with photographic ID and proof of ownership of the car. The price of a new key is £312.80.

At that price, I'm willing to get my old Weller soldering iron out and replace the washer in my solder-sucker.

Has anyone done this / any comments / references / links ? Or do I just put my hand in my pocket . . .

 

[Argyll Andy]

I did it on my E90 but it’s the same key and provided info on Z4 forum. HTH

Key Fob/Battery question - Z4-forum.com

 

[AleNod]

Thats what I was looking for - thats more comprehensive than I recall seeing - thank you @Argyll Andy !

I'll investigate a little on the weekend and get relevant bits, I'll add notes in a couple of weeks time to confirm.

Many thanks !

 

[AleNod]

There is now a better answer on the forum, so probably easiest to link to the other article.

Incudes links, photos, how-to from @Corky999 - thanks bud.

Changing a rechargeable battery in fob,

Not sure if this helps anyone but my second key was dead and wouldn’t recharge. I bought a new replacement rechargeable battery bmw button sticker and new fob, cut open old fob to take circuit out, melted solder for battery and pulled off, pushed new battery in holes and bent ends then re...

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