BMW key charging

**tomvleeuwen** · 25th May, 2018, 09:04 PM

The BMW diamond shaped key is charged in the ignition slot, but how do you charge it if you don't want to use the car?
Is there a special tool? I don't want to open the key, since it never looks good after it has been opened.

Even new dealer keys come with empty batteries once in a while, and I can't send the customer away without teaching in the remote.

**p1et** · 25th May, 2018, 09:09 PM

Miraclone can charge it using it's own coil but it's not even worth to try... Every self charhing battery have itself expire date, same for car battery. So ff that battery start to failing, then just replace with new Panasonic battery and change key shell. Personally, because of this problem, I stock only chinese keys with standard batteries...

**tomvleeuwen** · 25th May, 2018, 09:23 PM

It's not a stock key, its a dealer key ordered on VIN.
I'm not going to open a brand new € 125,- dealer key to replace the battery. Before you ask, the dealer won't take it back unless it still doesn't work after driving with it for a week, but the customer won't like it.

I was looking for a more cost-effective solution anyway, but apparently it's not so common. Maybe I'll make my own.

**Gavra** · 25th May, 2018, 10:55 PM

use toothbrush charger......

**doolittle** · 25th May, 2018, 10:55 PM

Tango has this charging function

**tomvleeuwen** · 25th May, 2018, 11:08 PM

Originally Posted by Gavra

use toothbrush charger......

Toothbrush charger works at 20kHz, key at 125kHz. I think the youtube video is a hoax, it never worked for me.

**dijo** · 25th May, 2018, 11:18 PM

ZedBull also able to charge this Key...

**Cr4nky** · 26th May, 2018, 06:42 AM

As already said, most transponder machines have this function. If you don't have one, then you could use reader coil off a car and rig up on bench to do it.