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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.
I very rarely need a full charge when I get a new phone. Battery rarely drops under 50% unless it's a heavy use day. However, that same phone 3 years later will be causing me issues because the battery doesn't last through the day.
I would happily trade off 20% max battery in the first few years, to get a healthier battery 4 years down the line.