Just Bought an X5

[upallnight]

If the battery in the key fob is dead, you can split the plastic key fob open and try installing a new battery so that you can at least get the doors open without breaking a glass. Or if the previous got the fob coded for auto windows, you can hold on to the unlock button and see if the windows will roll down.

If the battery in the x is dead you can connect a charger to the starter and chassis and see if you can charge the battery up enough to open the door. The other option is if you can open the hood there's a charging port on the firewall and driver side fender (Ground).