If you've recently experienced an issue with your laptop battery, it's possible that it has gone into battery saver mode. Battery saver modes are designed to help conserve energy and extend the life of your device by reducing its power usage. Fortunately, there are a few steps you can take to get your battery out of this mode and back up and running again.
The first step is to check if there is any software on your computer that could be causing this issue. If so, make sure all programs are closed and restart your device before proceeding further. Once rebooted, open the control panel in Windows or System Preferences in MacOS and look for settings related to power management or battery optimization - these will usually tell you if they're enabled or disabled. If they're enabled, try disabling them then restarting your computer once again (doing this should cause the system to recognize that changes have been made).
Another way to identify potential causes of a stuck-in-saver-mode battery is by checking for outdated drivers on the manufacturers website - old versions can often create compatibility issues which lead to unexpected results like this one. Additionally, run a full scan with antivirus software as malicious programs can also interfere with normal operations from time-to-time.
Finally, if nothing else works try doing a factory reset of your laptop (which means setting it back up just like when you bought it new) as corrupted files may be causing some sort of conflict between hardware components or other background processes which might not show up otherwise during regular troubleshooting procedures. Doing this reset should eliminate any errors caused by misconfigured settings while also refreshing all internal components at once so they essentially start anew without having anything previously installed interfere anymore moving forward.