
Well, had an issue with one of my remote keys for the BMW, it would not unlock/lock the doors when pressing the key...

There is Quite a lot of technology involved with this key fob, and the car,,, firstly the BMW's have start buttons on the dash one pushes the key fob into a slot on the dashboard then the driver holds down the clutch pedal, press the start button and then car starts.
Wile the key fob is pushed into the cars slot it is getting charged by a sort of magnetic field signal, there is a small button size Lithium technology battery VL2020 installed inside the key fob.
These key fobs and battery are sealed units although they normally last 10,years or 80,000 miles before replacement. although if the spare key fob is put away for emergency's the battery gets discharged and sometimes will not recharge when used in the car. these key fobs are meant to be used with the car to keep charged.
BMW, Dealers,,, want anything from £200, £300 for replacement key fob and programming this price can be up too over £500 for lost broken key fobs on newer cars depending on Spec.
I do have another spare key although really you need 2 keys in-case you lose one or damage it. as your going nowhere.
Here bellow is my solution to the problem see bellow...

See bellow my fix,,, this guy in the video is not me!,,, and is rather dangerous working practice....

the key fob bellow.
https://www.youtube.com/watch?v=-DCDpwG-TA4
The rechargeable Lithium VL2020 Battery.
http://uk.rs-online.com/web/p/coin-butt ... s/0407877/
This saved me over £200-£300 for key fob from BMW.
It works a charm.....
