Guys,

I am having problem with my E53.

I unlocked my car with the remote, turned the key into position 2, NAV system turned on and I unlocked the PIN. After 10 secs, the NAV system turned off and I tried to start the car but nothing.

I tried a few times to turn off the car, locked the car and re-unlock with the remote and tried to start the car but unsuccessful. The NAV system also doesn't power on.

Now, I cannot lock my car with the remote. If I turn the key into position 0, there is a loud beeping sound keeps going on under the hood. (I guess it is the beep from alarm). If I turn to position 1 or 2, the lights from glove box and trunk keep blinking.

What's wrong with my car? Is the battery low or dead or something else?

How much does an original battery cost? Can I get that from other stores besides dealer?

Please...! I really appreciate if someone here can give me some hints. Or else my car is stuck in my driveway.

Thanks!