hi , ok got battery issue of my own but wont dwell on them, am still diagnosing my problem , Powers1 and bcredliner have pointed me in the right direction check all fuses in glove compartment and rear with multimer (with car off of course), see if any show amp loss....they mention common issues is the phone fuse 74 at rear, and I am hearing that afgermarket gps alarm systems can be an issue....i have one but cant find it as is concealed by company that installed it for previous owner...!

FSR is quoted as another one causing drains but not sure how to test apart from pulling out (not easy apparently) sorry i couldnt be of more help..keep us posted

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N