Hey Dave you know this video means you have to finish the µCalc right? ![Tongue :P](https://www.eevblog.com/forum/Smileys/default/xtongue.gif.pagespeed.ic.J5mTe0A2NA.png)
Dave, let me guess how this went - lots of enthusiasm to get a nice hardware & mechanical design, built the board, wrote enough SW to test the hardware, but then got bored at the prospect of writing all the software...?
I often get the same thing - I _love_ doing hardware & mechanical design but getting stuck into the software tends to be a far less exciting prospect... Once I get stuck into it, it's usually OK, but I tend to get very easily distracted into doing anything else apart from getting started.
I wonder if the answer might be to build a few & let someone with more software enthusiasm do some software in exchange for splitting the proceeds of sales?
BTW for the detail of connecting the top/bottom battery contact, a small leaf-spring contact type arrangement would probably be the ideal solution.
Also, instead of gluing together, which is a bit permanant, I wonder if there are some tiny screws you could use, or maybe rivets, which could be drilled out.
Another option may be careful use of hot-melt inside cavities in the inner core spacer , which would allow seperation by applying heat - maybe have some thermal vias in the rear cover to make this simpler.
Or larger holes in the rear, into which the hotmelt is injected while the sandwich is clamped together.