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I recently bought a new phone (Samsung Galaxy 3) and when the battery is fully loaded, it says like "Battery fully loaded, pull out the chord". Is this a typo from Samsung, or would there theoretically be any reason (for battery saving purposes) to always have it going from the battery, and not from the chord.

(Ftr my phone is set to Swedish language)

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My Nokia telephone displays a similar message. As it says something like “to save energy”, I think the explanation for this is not physical but marketing. –  b_jonas Aug 23 '12 at 10:07

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This is probably not a physics question, but anyhow ...

Any modern phone will not allow it's battery to be overcharged so leaving it on the charge won't overcharge it. However some phones will cut the charging at 100% then resume it at around 90%. You may find when you disconnect the charger that the battery is somewhere between 90 and 100% charged. I don't have an S3 so I don't know if the S3 does this. If it does your phoine would be continually cycling between 90% and 100%, which I suppose could shorten battery life, though I'm not sure it would be worse than removing the charger and letting it fall to a lower level.

There is an article on battery life here, and this is an interesting read though I'm not sure it sheds much light on your specific question.

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As a reminder, if you think a question is not physics-related enough to be on topic, the best thing to do is vote to close accordingly. –  David Z Aug 23 '12 at 11:22
I searched all the stack exchange forums and physics was the most relevant. –  Viktor Sehr Aug 23 '12 at 21:30

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