Mac battery drains faster after macOS Tahoe

It is possible there are processes running in the background that are using significant resources. Check Activity Monitor, CPU tab (sort by % CPU) and Memory tab (sort by Memory) to see what's running hard.

Activity Monitor User Guide for Mac - Apple Support

MisterX268 wrote:

Hello, after upgrade mac os to macos Tahoe 26.1 the battery started to discharge faster. What should we do? waiting new update?

You can always wait for a point update...

see the ref included here 3 pages in: Battery Draining Fast since Tahoe upgrade - Apple Community

note: https://www.macobserver.com/news/developers-push-fix-for-macos-tahoe-gpu-slowdown-in-electron-apps/

The current stable release of Tahoe including bug fixes, security updates is macOS 26.1

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support