

That’s conventional wisdom for lithium ion batteries. Keeping it between 20 and 80 percent will extend its life. But that doesn’t mean charging or discharging it fully will be bad immediately; the effects are small but cumulative. And while battery tech improves, this guideline will probably be less important.






I mean, they have to pay the bills somehow. And this shows maybe how bad financially they’re off. Before the internet, you had to buy a copy of the book. I suspect those sales fell off a cliff in the last 25 years. So I may not like this decision but I can understand it.
And as others have suggested, there are other ways to get what you need online. This is a strong atmospheric disturbance in a serving vessel for hot infused beverages.