In the trunk.
$2000
in the trunk under the liner.
I was informed by a BMW dealer there isn't a battery to replace and you have to order a new remote and then have it programmed by the dealer.
Seven years
In the trunk on the passenger side of the spare tire well.
The fluid in the battery is around 65% distilled water and 35% sulfuric acid.
In the 2006 BMW 530xi, the battery is located in the trunk, specifically on the right side underneath the floor mat. To access it, you need to lift the trunk floor cover. This location is typical for many BMW models, designed to optimize weight distribution and trunk space.
Either in the trunk of under the rear driver seat
on ur trunk on right side just pull that thing on the left side and u see the battery :)
To change your batter in your BMW 5 series first turn your car off. Then remove existing battery by losing the bolts and removing the positive and negative cables from the battery. Install the new battery by bolting the battery in place and reattaching the cables.
Right side fenderwell in trunk under toolkit shelf