When my stock battery died a while back, I replaced it with a PC680MJT. I have a small system (a 4x75 and 1x500 amp) so the battery couldn't keep up with the sub when I was idling. So after measuring alot, I bought a PC1200MJT and went to work trying to install it while keeping it looking as factory as possible.

1. Start by pulling your battery out along with the plastic piece underneath it. Then take the metal bracket out that the battery sits on. It's held on by 2 screws on top and 2 screws on the bottom.

2. I made a template in Microsoft Word to the exact size of the battery. You'll see that in a second in one of the pictures. Using this cut the metal bracket in the places I did in order to fit the battery on it. The PC1200MJT is slightly bigger than the stock battery so you need to cut the metal tabs that stick "inward". I made some slits in the metal with a hacksaw and bent them down with a pair of pliers. Then I hammered them flat on a piece of wood.









3. Once this is done, put the black plastic piece on top and mark where you need to cut. You can use the paper template as well to help guide you. It should look something like this.



4. Start putting everything back together making sure you have clearance around the battery. You want it as close to this bolt which is towards the headlight as possible in order to use the stock battery hold-down piece.





5. When I installed my PC680MJT, it was way too small to use the stock hardware. So I bought this plastic battery hold-down from Autozone which came with 2 j-hooks for a couple bucks. Since the PC1200MJT is shorter than the stock battery, this piece fit beautifully on top and took up the slack. I cut the tabs on the end so that it would fit next to the fender support. I won't be using the j-hooks on it anyways so off they went. By the way, I'm just showing you the before and after on each side. In the end, both sides of the plastic piece were like the right side in the picture.





6. The metal stock hold-down piece has a tab which is bent down. I just hammered it up so that it would fit on top of the plastic piece I had from before.





7. And that's it. Start putting it together. These pictures will show what it looks like when you're all done.









FYI, Odyssey batteries (I think all AGM batteries actually) use a different charging profile than what typical lead acid battery chargers provide. So I bought this charger from them since my car sits for long periods of time. I think it was like 40 to 50 bucks.


The specs on the Odyssey batteries can be found here for whoever is interested:
http://www.odysseyfactory.com/battspecs.html

 

Nice Job