Litium battieries don't last forever, and you might be shortening their life! Turns out that if you use a notebook as your daily driver and have it plugged into the most of the time that battery is constantly being charged. Charging a notebook creates heat, that heat and constant charging shortens the life of the battery. Remember the exploding Samsung cell phones a few years ago?
Machines made with in the past few years started implenting an optional change that helps that battery life. Basically the machine no longer charges to 100%. It charges to a lesser amount and hovers there. In the case of Microsoft Surface note when this option is turned on, the machine charges to a maximum of 50%. The obvious downside is that if one then needs to run off of battery one doesn't get the benifit of a full chager. I have noticed that the machine is notiable cooler.
Instructions for Microsoft Surfaces can be found here. Many normal machines: go into the BIOS, Power Management, and change the setting to "Primarily A/C Use".
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