The battery in the key is recharged wirelessly... a coil in the black round part around the key hole charges up and releases causing a charge to build in a coil in the key, which charges the battery. Think of it as a small, low power version of an ignition coil. There is no physical link from the charging input to the voltage output.

And on a fully discharged BMW key it takes 48-72 hours straight to bring it back to full charge.

__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

You make something idiotproof, they'll make a better idiot

You think professional is expensive, just wait until you pay for amateur.

Never let your sense of morals prevent you from doing what is right.

Examine what is said, not who speaks.

X5 pics

RIP 4.6is.....

2003 4.6is