Now it's time to make a battery box. I'm using a Ballistic lithium ion battery. It is extremely light, pretty small, and can be mounted in any position... which is handy.
First I made a drawing and traced out another foldable box. The chicken scratch.....
Then I cut out the basic shape with a grinder and cut off wheel. To keep it accurate I use an exact knife to score the steel. It is very easy to see in the steel and much more accurate to follow with a cut off wheel than a thicker marker or grease line.
As mentioned previously, the folding grooves cut half way through. The sharpie arrows pointing to the line are which side I'll start the cut on. Gotta account for the thickness of the steel. I'm using 16 gauge steel again.
Then the folding begins. A little heat helps. To keep the bend crisp I clamp a piece of flat stock to the edge making sure it's square. Then heat and fold. I use a little 90° square to fold it perfect. This usually takes a few attempts of unclamping, checking, reclamping and adjusting.
Here it is all folded, squared and welded up. I welded all four corners from the inside. The tap sticking up on the one side will be folded over to hold the factory rubber battery hold down strap. Then I'll make a tab out of 1/8" rod to hold the other side.
On the bike. I'll also mount the shock reservoir to the side of the battery box. I will line the inside of the box with some rubberized foam after it gets powder coated.