I asked about this the other day since I was going to be autoxing an hour away tommorow and as not to waste my time I'd like to pass tech, anyway, I did a home depot run and a little work and I made myself a tie down. Eventually I'll move the battery to the trunk, but for now this works. Since I hadn't seen a front tie-down before, I figured I'd share:
Edit: I can only confirm this works with the bosch battery. Other batteries might be different.
Home Depot tie-down:
I used:
2x - 8"+ x 1/4" thread
1x - 12"+ x 1" x 1/8" plain flat metal strip
6x - 1/4" nut
3x - 1/4" washer
2x - 1/4" lock-washer

It goes across longways.

Take out the battery. You can use those two holes already in the battery tray. I had to drill the inner hole out a very little bit to fit my bolt through.

Cut the thread 8" long, and put a nut at the end you cut. Then melt/mash/weld/whatever the nut to the end so it doesn't move and you make a bolt. Repeat on the other end. If you can find 8" 11mm bolts somewhere you don't need to worry about this.

Cut the metal stip 12", put the battery in and mark it where the bolts will go through. Then drill it.

This is what the setup looks like not in the car.

Thead the bolt through the hole, then put the washer, lockwasher, and bolt down, then tighten it up. Repeat on the other side.

Put in the battery.

Slip on the metal strip, tighten it on.

Viola! That baby isn't going anywhere.
Edit: It was pointed out that I should paint the flat metal, and probably the thread too, in order to avoid the corrosion that occurs near battery terminals. This is a good idea.
Edit: I can only confirm this works with the bosch battery. Other batteries might be different.
Home Depot tie-down:
I used:
2x - 8"+ x 1/4" thread
1x - 12"+ x 1" x 1/8" plain flat metal strip
6x - 1/4" nut
3x - 1/4" washer
2x - 1/4" lock-washer

It goes across longways.

Take out the battery. You can use those two holes already in the battery tray. I had to drill the inner hole out a very little bit to fit my bolt through.

Cut the thread 8" long, and put a nut at the end you cut. Then melt/mash/weld/whatever the nut to the end so it doesn't move and you make a bolt. Repeat on the other end. If you can find 8" 11mm bolts somewhere you don't need to worry about this.

Cut the metal stip 12", put the battery in and mark it where the bolts will go through. Then drill it.

This is what the setup looks like not in the car.

Thead the bolt through the hole, then put the washer, lockwasher, and bolt down, then tighten it up. Repeat on the other side.

Put in the battery.

Slip on the metal strip, tighten it on.

Viola! That baby isn't going anywhere.
Edit: It was pointed out that I should paint the flat metal, and probably the thread too, in order to avoid the corrosion that occurs near battery terminals. This is a good idea.
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