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What is the ideal temperature for long-term storing of Lithium-based batteries?

By Werner Ruotsalainen, Submitted Monday, October 17, 2005
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http://www.smartphonemag.com/forum/topic.asp?TOPIC_ID=18761

Q: What is the ideal temperature for long-term storing of Lithium-based batteries? A: As can be seen here, 40% charge level is the most optimal storage charge level of Lithium-based batteries: The recommended storage temperature for most batteries is 15°C (59°F). While lead-acid batteries must always be kept at full charge, nickel and lithium-based chemistries should be stored at 40% state-of-charge (SoC). This level minimizes age-related capacity loss, yet keeps the battery in operating condition even with some self-discharge.
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