Try to turn your steering wheel all the way to the right and then all the way to the left. This restarts the computer and clears all the little lights on the dash board. This will only clear if the battery is the right one, and that everything was done right. Remember, when jump starting your X5, you need to turn on the A/C and the rear heated window to keep the rpm a little higher to be clear of electric surges, this info is in your manual (section for jump starting).... The battery light is on because the current is not right. You must not have the right battery. If it is an alternator, then your X5 will die out in a few days or hours. Go get that checked out before you continue to drive.... Good luck....