Thanks to everyone who continues to submit DIY's for the E60 M5 - I would be lost without these forums.
I just replaced the battery on my 2008 E60 M5 (10/2007 build) and figured I would share my experience and pictures.
My car had a BMW part # S61 21 6 919 342 battery in it, which is a 12V 90Ah 900A 160RC 900CCA. The battery has a black case, and after doing some research here I found that the best replacement that was readily available to me was a Duralast Platinum H8-AGM from my local Auto Zone.
There are tons of posts about which batteries to use, whether to reprogram or not, etc. I read them all and decided I would simply pop in the H8-AGM and not reprogram.
Please note that I am not a professional - just an enthusiast with a camera. Do your own research before attempting any of this.
My original battery:
Here is the new battery:
- 13mm and 10mm socket
- Pick (optional, but handy for the vent tube cover)
What I did:
1. Turn on car, open window, unlock doors, shut off car. I read something about not letting the car go to sleep, so I started working right after shutting off the car.
2. Remove trunk carpeting/floor (our battery is where the spare would be, not on the side of the trunk like other E60's I have seen) to expose battery.
3. Remove the battery brace, a metal bar that holds it in place. There is a small plastic wire organizer that easily unsnaps to move the wires attached to the brace.
4. Completely unscrew and then remove the negative (black) terminal first, and cover it with plastic.
5. Pop open the red plastic cover on the positive (red) terminal, completely unscrew it and remove it from the battery. It moves up and out of the way easily.
6. Remove the vent tube on the driver's side of the battery. It pops out easily, just wiggle it back and forth.
7. Pull out the battery. The styrofoam around the battery will travel with it a bit, so be ready to just carefully work the battery out.
8. Use a pick or something similar to carefully remove the vent tube cover on the original battery and place it in the same spot on your new battery (the H8-AGM has two vent tube holes, but the car only has one vent tube).
9. Put the new battery in, working once again with the styrofoam to keep it in place.
10. Pop in the vent tube.
11. Reconnect the positive (red) terminal and replace the plastic cover (it pops off the old battery easily).
12. Reconnect the negative (black) terminal.
13. Reattach the metal brace that secures the battery in place.
14. Replace your trunk floor.
15. Start your car. Set the date and time. These were the only two settings I lost.
I started the car and drove it for a bit, and everything seemed fine despite not having programmed anything. I will follow up in a few days after I am confident it is still fine.