[all variants] laptop battery (myths)

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http://ubuntuforums.org – i have been hearing these 2 things about laptop battery usage: when working on ac power remove your battery. never charge your battery when it is not fully discharged and (vice versa) always charge an empty battery to the end. are these really true that they really maximize battery life? i would like to know your opinions ps: i have 6 Cell Lithium-Ion sony battery on my thinkpad sl500 (Hardware)