Google has confirmed that the recent battery drain issues on Pixel phones are being addressed by Instagram. The social media platform has rolled out an update to fix the problem, available now in version 382.0.0.49.84 from Google Play. Users can check their app’s version number by long-pressing the Instagram app and tapping “App info.” This issue was reported to affect Pixel models with the May software update, but it appears that Instagram is the main culprit behind the problem.
Source: https://www.theverge.com/news/676032/google-android-instagram-battery-drain-update-fix