Hi mate,
Really easy to change, first you need to put the bonnet in its service mode, by unclipping the gas struts from the wings then raising the bonnet to 90 degrees vertical and locking it in position by sliding the locking plate over the pin on the bonnets hinge.
Next disconnet the the negivate battery cable from the bulk head terminal, then you have to wait 15-20 minutes for the airbag system to discharge (the system has capicators that are still charged when the battery is disconnected and takes around 20 minutes to fully discharge these) the reason for the wait is on the positive battery terminal there is an explosive charge that cuts the positive battery wire if the car is in a crash.
Once you have waited disconnect the yellow explosive wire (dont worry it is safe now) then remove the possitive battery cable from the battery.
Once you have removed the cables, there are two long bolts that hold the battery in place, remove these and their plates then carefully lift the battery out (you may need a second person to help you lift it out, i lowered the air supension into access mode before i disconnected the battery to make it a bit easier)
Once you have put the new battery in and bolted it back down, its just a case of reversing the procedure, connect the possitive battery cable, connect the yellow explosive wire then connect the negative battery lead.
Good Luck!
Matt
