How a lead-acid battery works

Batteries are just so freakin' cool.

I had no idea the specific chemistry inside a lead-acid battery. Lead plus lead oxide making lead sulfate in each case...brilliant.

The comment at 3:00 - "with most engineered objects, there are going to be trade-offs, giving away the characteristics you want to gain others you must have" - is a marvelous summary of much of our design challenges.