To make the batteries more convenient to charge, I made use of my computer modding skills to build an all in one power supply and charger. I pulled the 12V 18.5A power supply out of a dead iMac I had lying around, and mounted it to a composite sheet. I screwed standoffs into the sheet, to make another layer above the power supply. The charger is held to the layer via some cable management clips that came with a PC case. I then mounted the whole assembly in an old ATX psu shell.
PSU:
Mounted together:
In the case:
I also made a parallel charging harness, so I can charge all the packs simultaneously.
Also, to prevent the chain from coming off, I built a chain guard out of some angle aluminum. I cut wedges out of it so I could bend it, and then brazed over the seams.
And a video. I made a camera mount out of an old cell phone holster, and it attaches just below the handlebars. It could use some more stabilization.
During this ride, I reached a max speed of 24 mph, and went 15 mph average while moving.
As you'll notice, it didn't go as smoothly as I had hoped. The chain guard did work, and I was able to go over the trail much faster than I had previously been able to. That is, until the chain broke the chain guard:
I've rebrazed it, but it obviously needs to be supported on both ends. Also, I managed to lose the master link of the chain at the end of the ride, when I went off the large bump between the grass and the asphalt. I ordered 5 more from McMaster, so they should show up in a day or two.
Also, some pictures of the whole thing: