I have a '00 X5 3.0 and I'm pretty sure the battery is really low and needs replacing. I try to start it, and when I turn the key the xenon lights start to flicker and it makes this loud clicking noise, simultanously with the flickering lights. Everything works fine, the radio, dash lights, etc;. I think it's just that the battery does not have enough power to start the car. Any ideas? Any help is greatly appreciated as this is an urgent matter. Thanks so much to anyone who answers!