When i saw Martin's video on his other blog :
http://www.youtube.com/watch?v=cAAUS6JB-YM , I took my old calculator from under the dust; An MBO Alpha 7000 'liquid crystal'.
For years i didn't used it. Put some batteris in it (button batteris for watches, or how you call them).
First the calculator didn't worked properly; half of the numbers, a calculation wasn't possible. Then i just left it on, and after 15 minutes, the display starts to works, calculate something is possible again.
Someone has a explenation for that ? I thought electronics works or not, this isn't an old engine
just curious.
some pics in the attachments. I used it in the '80-ties.