Lol, I just did a search and came up with that exact question I posed to the maker of the TME Xtrema:
http://tmenet.com/forums/index.php?t....msg800#msg800
Another bit of info on this topic, but does not state "why":
http://www.kongpower.com/faq_en/show...xt01=&srhTxt02
The batteryuniversity blurb I was referring to:
http://www.batteryuniversity.com/partone-5A.htm
Specifically:
Quote:
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-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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This page also talks about storage (towards the bottom of the page), but seems to simply regurgitate the same vague answers found elsewhere:
http://www.rchelicopterfun.com/rc-lipo-batteries.html