Prof x5, just as a side note about jumping any car (whether with another vehicle or battery pack) it is proper to have the jumping vehicle/battpack off and connect cables then turn jumping vehicle/batt pack on and let it charge the receiving car for 10 mins minimum so it has a "base" charge. Then try turning over your car. It will be easier on both batteries.
I hope you can grab a new batt. Lots of awesome threads on which battery to buy

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S