This is a closup of how the cells are held down.
The threaded rod are welded to the base of the battery frame and the top nut/washer (silver soldered) combination (eventually covered with felt) supports the clear poly-carbonate cover.
In the final production, instead of the nut and split washer combination, I used Nyloc nuts (a special nut with a nylon insert crimped in), these offer great resistance against vibrating loose
Checkout the blog for more photos:
www.evplus.com.au/evplus_blog.htm
