Hello Ria, this is Emily.
I am sorry you are having this issue with the laptop. When you are using battery only, does the percentage goes down over time?
When it is charging, does it charge up to a certain perfectage only and then stays on that, or it just won't increase no matter what starting perfectage you might have? Some computer manufacturers have preinstalled power or energy management app, where some optimization is enabled to prevent battery from charging to 100%. Just want to make sure that's not the case for yours.
Otherwise, consider reinstalling the battery driver. Go to Device Manager, click to expand the battery section. Right click on each item listed and uninstall it. There should be two of them. Uninstall both. Restart the computer and see if it helps.
Please let me know how it goes and I am happy to help you explore further as needed. Thanks!