Dell Power Manager's Battery extender feature allows you to conserve battery charge.
NOTE: If your system does not support Reduce CPU Power (Quiet Thermal Setting), then the battery extender feature is not available.
NOTE: Battery extender only reports setting changes you make within the battery extender feature. Changes you make within the BIOS and operating system settings that affect battery charge consumption are not reflected within battery extender.
NOTE: Battery extender cannot be turned on when you have plugged the system into an electrical outlet.