Samsung NP300E4A-B01JM - Manual (Page 86)

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Chapter 4.
Settings and Upgrade
Battery
Extending the Battery Life (Optional)
In the Settings program, click Power Management and set the
Battery Life Extender to ON or OFF.
OFF
This mode maintains 100% of the battery
charge when using the computer on AC power.
In this case, although the battery use time
increases, the battery life is reduced.
ON
This mode maintains 80% of the battery charge
when using the computer on AC power. In this
case, although the battery use time decreases,
the battery life is extended.
Alternatively, to extend the battery life
Press the F2 key when the Samsung logo appears in the
booting sequence to enter the BIOS Setup, select Advanced
> Battery Life Cycle Extension, and set it to Enable.
Then you can use the battery life cycle extension mode.