I don't post very often on any forum. What usually happens is I think of some idea or question and by the time I sit down to type the actual message my brain power (such as it is) has been redirected to something else.
I'm very happy and surprised so many of you are interested in this topic.
Batteries have always been 80% science and 20% alchemy. I'm sure many of you have read about the primitive batteries found in the ruins of several ancient civilizations. They usually look like a cup made of stone with a metal rod stuck in the middle. Anyway, us humans have been experimenting with batteries for a very long time!
Batteries have been the biggest curse and blessing of every circuit designers life. I can't remember how many times I breadboarded a circuit with a certain battery in mind. Every component had to be chosen with extreme care so that in end the selected battery would be adequate for the job.
Maybe in the next few years there will batteries (or even some kind of fuel cell) that will allow for the construction of a really good battery powered electric mower. It's always nice to dream a little, even if you're not a kid anymore.