Excerpt from
http://www.batteryuniversity.com:
Quote:
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Originally Posted by batteryuniversity.com
-The time at which the battery stays at 4.20/cell should be as short as possible. Prolonged high voltage promotes corrosion, especially at elevated temperatures. Spinel is less sensitive to high voltage.
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So, keeping the cell at half charge ensures the voltage to be at the nominal value. I'm sure you could discharge as needed until the open-circuit resting voltage is ~3.7v...