i have tried using a different key, even the valet key but that was a no go. I recently jump started the car when this happened last time and it worked, i am convinced that it is a battery issue. I will replace my battery my tomorrow and does anyone know what is the best battery to buy for a X5?

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" Despite its supercar attributes, the M5 still doubles as a soberly practical, spacious saloon - only with the ability to scare four passengers in comfort all the way to the local coronary unit". Top Gear