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It's correct that you'll retain battery capacity better if you store it at 40-80%. But that recommendation is based on long-term storage.

It's not right to assume that also applies to in-use products, especially the way people use them. In fact you'd likely reduce battery life because you're putting the battery through a greater depth of discharge (DoD). Assume you let it run from 80% to 60%, you've just gone through a cycle of 20% discharge when you could have kept the DoD at 1%. Also, most modern laptops will run on power once charged, so it's not like an infinite number of 1% cycles.

http://batteryuniversity.com/learn/article/how_to_prolong_li...



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