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Why Charging Your Gadgets Over 80% Is Such a Bad Idea | iFixit News
(www.ifixit.com)
This is a most excellent place for technology news and articles.
That's correct, I agree with you.
That requires this knowledge of how batteries work. Saying keep a battery pack and your phone at 100% could leave people in a situation worse than if they just used the battery manager to stop their phone at 85%. 99% of people will plug their battery pack in until it's full, stash it wherever they decide for emergencies, and will find a dead pack when they need it.