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Using Ubuntu 12.04 over ASUS K55V I wonder if it is possible to turn off battery charging and run the system over direct supply??? This function is available with dell laptops in Microsoft Windows. Is this function available within Ubuntu???

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Does your ASUS laptop support this in Windows?, because you know.. Dell and ASUS aren't the same thing, let alone the Dell reference you use might not have the same components as your ASUS laptop. – Uri Herrera Dec 19 '12 at 21:15
Just a question, why in the world would you ever want to do this? – coteyr Dec 19 '12 at 21:25
@coteyr just to obvious to increase battery life,as battery charging is based on number of counts it charges,if charging is turned off when there is continues AC supply, you can save your battery life :) – Aks Dec 19 '12 at 21:32
@aks, this is incorrect. That would almost certainly end your battery prematurely (if it's LiON). See Tip #3 and the section about storage Short version your LiON battery needs a constant power supply to do it's job correctly, "cutting it off" would result in a "discharge" and cause you premature hardware failure. – coteyr Dec 19 '12 at 21:40
well not constant but they should be kept full when ever you can. – coteyr Dec 19 '12 at 21:41
up vote 2 down vote accepted

This is a hardware option and not software. That said the answer is almost 100% no. Even the "dell" laptops don't really turn off charging. At a hardware level LiON battery need a very small charge 100% of the time or they will discharge (or worse, burn out). Most charging circuitry will handle this by discharging and recharging the battery in a tiny increment.

Even Dell laptops would be subject to this requirement if there running LiON batteries.

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