For extreme battery conservation, use the Ultra Power Saving Mode ... you can significantly improve the battery life of your Samsung Galaxy S21, ensuring you get the most out of your device ...

PERFORMANCE: Overall the Samsung Galaxy S21 5G was very good. Its quickness, battery life, and camera quality will satisfy all but the most discerning users. Ease of use on the Galaxy S21 5G was ...

I wasn't overly smitten by Samsung's Galaxy S21 FE — it's based on last year's premium Galaxy S21 specs, and it's not quite as good as the original Galaxy S21. Battery life was especially poor.