Disable: 'Allow definition updates when running on battery power' This policy setting allows you to configure definition updates when the computer is running on battery power. If you enable or do not configure this setting, definition updates will occur as usual regardless of power state. If you disable this setting, definition updates will be turned off while the computer is running on battery power. Counter Measure: Configure this setting depending on your organization's requirements. Potential Impact: Definition updates will be turned off while the computer is running on battery power.

(1) GPO: Computer Configuration\Administrative Templates\Windows Components\Windows Defender\Signature Updates\Allow definition updates when running on battery power (2) REG: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows Defender\Signature Updates\DisableScheduledSignatureUpdateOnBattery