If you are looking for a for mobile, these built-in or third-party options are popular:
A specialized app that manages sync and network connections to preserve power. download battery mode
Adjust brightness for both internal laptop screens and compatible external monitors. If you are looking for a for mobile,
A feature on Google Pixel and Samsung devices that disables all but essential apps like Phone and Messages. Battery Mode - Download download battery mode
You can download Battery Mode for free on all versions of Windows from XP to Windows 11.
You can select between the Standard Installer (for a permanent setup) or the Portable Version (runs without installation).