We who have been in batteries for awhile have also been bit by at least one thing or another. Another well-known battery company (I won't slander them here) had a supposed AA-size battery that the comapny boasted something like 15% greater capacity than any other competitor -- sure, until you discover that it had a larger diameter that gave it 15% more volume! When a few select customers complained, the company said the datasheet clearly shows the size, but would consider marking it differently than just plain 'AA'. They never made any change. Needless to say, the production run was short lived.
Another bad experience, is with cheap-spring battery holders. I designed a project using Energizer's L91 ultimate lithium battery in a battery holder. The AA battery delivers quite a punch. In my prototype, I bought a spring battery holder from [R..io Sh..k], which had bright silvery-looking contacts and springs. In about 30 seconds or so, the plastic holder was melted and the circuit quit. Measuring the contact resistance with a good 4-wire ohm meter revealed the problem. Eleven watts dissipated on a tiny spot builds heat, and the hotter the contacts got, the higher the reisitance -- talk about thermal runaway. Since I didn't plan on using that battery holder in production anyway, it turned out OK, but I did check the production version before release.
It seems like there would be many books already out there by now. I will take a gander at what is available, and if it looks like they aren't covering the topic like I want, I would consider writing one.
No, I would not be writing it for the money. Besides, I will have already given away most of the really good stuff for free for all the EETimes readers, anyway!
I think that once Ivan has finished covering all of the various battery types, followed by his "grand comparison," this series is going to make an invaluable quick-reference guide to battery technology
I think it could be expanded and made into a book. I know I would buy it. Please Ivan, allow Max to persuade you to do it. I am sure he would happily write the foreward. Just don't expect to become rich!
@Antedeluvian: Another great part to your continuing series.
I agree -- I think that once Ivan has finished covering all of the various battery types, followed by his "grand comparison," this series is going to make an invaluable quick-reference guide to battery technology.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.