Cabdullahi
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That used to be the case with the older batteries but its really bad for li-ion batteries. If you continually discharge them completely they start to fail quickly.
http://www.batteryuniversity.com/index.htm has some good info.
http://www.batteryuniversity.com/parttwo-33.htm
http://www.batteryuniversity.com/parttwo-34.htm
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''however some battery experts say you dont need to discharge completely to start charging fully they say that at about 30% of charge left you should charge fully.''
^ you ignored this bit of my post which gave the other side of the argument.