Hi @rohanramesh1853
The battery is starting to swell and it should be replaced as soon as possible.
Here's a [https://www.youtube.com/watch?v=RflbcTZxsDE|video] that shows what to do.
Search online for [https://www.google.com/search?client=firefox-b-d&q=BLP-845|BLP-845] to find battery suppliers that suit you best. (supplier examples only)
Remember to dispose of the old battery responsibly. The environment will thank you for doing this.