key battery

How does one replace the key battery. I have a 2002 330xi and there does not appear to be a screw or clip that would allow the plastic to be opened for battery replacement. Thank you. Sam

I am not 100% sure on this, but I think this may be one of those keys that charges when in the ignition. If so, you can't replace the battery. Looking at the parts diagram, I think this is the case. Try using the key in the ignition on a longer trip and see if that works. Otherwise, you need to visit the dealer.

Agreed. The battery is not replaceable. It charges while in the ignition. I am not certain what position, if any, the ign must be in to charge. I would put a trickle charger on the car battery, put the key in the ign and turn it to ACC and let it sit overnight.

thank you-- you are both correct-- the battery is not replaceable for this year and model--- but the key is - for $160.00!!!! -- sam

160 and they may charge you to link it to the car as well. My wife lost one of hers and we need to replace it but its a hassle. Need the title, a wad of cash and 2 trips to the dealer.

Thank you. that is the price I was quoted. Fortunately the spare key still works. I will use that until it dies on me, then decide if I want to pay $160.00 for a key.

The problem is if you loose your last key the car isn't moving under its own power for a week while the new key ships from Germany.

I really need to get off my butt and order that new key.