Power Nap allows the system to stay in low power mode, especially while on battery power, and periodically connect to previously known networks with stored credentials for user applications to phone home and get updates.This capability requires FileVault to remain unlocked and the use of previously joined networks to be risk accepted based on the SSID without user input. This control has been updated to check the status on both battery and AC Power.The presence of an electrical outlet does not completely correlate with logical and physical security of the device or available networks.