Here is my lab. Sorry about the picture quality. I probably should get a fisheye lens..

if this works correctly, it can also be used with single solar cells or very small ones.  

Here are the sources for the DSP and the display/storage. They are as-is, but I hope someone will find them useful.

Therefore, my home lab is in summer-mode now :-)

One nasty habit of batteries is that they tend to start leaking when totally exhausted. The chemicals those things leak ususally ruin the device they are in. Therefore, when one does try to totally exhaust batteries till the last drop, one should add some kind of leak detection as well, to prevent damage to the battery holder, and possibly other...