Battery hold down for track car?

[Mick]

I recently switched from an Odyssey PC680 to a larger battery (still smaller than stock) and need to come up with a mounting solution. I would like to keep it in the stock location.

The battery is currently sitting on the plastic tray and while I could come up with something to secure it to that, it seems pretty flimsy. I'm curious what others have done.

[99M3Riverside]

I believe they have a mounting kit. I had one in my old track car. Do a quick google search I believe

[Mick]

What did you mount it to? Most I've seen are bottom mount and the stock battery tray is just plastic held in with a single bolt. I assume I'll have to remove that and fabricate a floor in the well but was hoping there was some other way to deal with it - like if someone made a metal tray insert or something.