The 6.7-inch Samsung Galaxy S21+ is the middle model of the three Galaxy S21 flagships and combines the best of two worlds: With an equipment very similar to the Galaxy S21, the size and battery are similar to the Galaxy S21 Ultra top model.
https://www.notebookcheck.net/Testing-the-Samsung-Galaxy-S21-The-larger-version-of-the-Galaxy-S21-with-a-more-powerful-battery.525594.0.html