Hi @redminote11t5g
Given your user ID I'm not sure if you want to change the battery in a Redmi Note 11 Pro or a Redmi Note 11T 5G.
Here's the ifixit [guide|152936] guide that shows what to do for this model.
Here's a video which shows how to remove the battery in a [https://www.youtube.com/watch?v=uEfuB48G774|Redmi Note 11T 5G] phone. It is seen being removed at 1:23 minutes into the video.
You can find the battery model number printed on the battery. Search online for ''(insert model number) battery'' to find suppliers that suit you best.