• Daniel Chaparro

Samsung Galaxy S21 - Battery Performance Score

Updated: Aug 25


Battery Capacity mAh: 4000

Smartphone Battery Performance: Ranking #54

In the Top 5 for Battery Performance within the

Flagship/Pro Tier Ranking Table

Battery Performance Testing and Review – March 2021


As the new member of the S family, the Samsung Galaxy S21 will be recognised in 2021. Samsung has chosen to remove some specs when comparing with the S20 from the previous year to gain in price competitiveness.

There is also the Samsung Galaxy S21 Plus option if you are looking for a larger screen and the Samsung Galaxy S21 Plus Ultra for those who are looking the best from Samsung.

Release Date January 2021

Product Features and Specification

  • Design: Plastic design with metal rails that flow into the camera bump on the back.

  • Front Camera: 10 MP Front camera, f/2.2, 26 mm, 1/3.24”, 1,2µm, Dual Pixel, PDAF

  • Rear Camera: Wide (main)12 MP, f/1.8, 26 mm 1/1.76", 1.8µm, Dual Pixel PDAF, OIS.

Ultra-wide angle: 12, f/2.2, 123˚, 13mm, 1/2.55", 1.4µm; Super Steady video.

Telephoto: 64 MP, f/2.0, 29mm, 1/1.72", 0.8µm, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom.

  • Video capture: Rear camera: 8K@24fps,4k@30/60fps, 1080p@30/60/240fps; Front camera: 4K@30/60fps, 1080p@3pfps

  • Battery: 4000 mAh (25W fast charge, 15W fast wireless charge, 4.5W reverse wireless charge, USB Power Delivery 3.0)

  • Display: 6.2"

  • Size: 151.7 x 71.2 x 7.9mm

  • Weight: 169g

  • Memory: 128/256GB 8GB RAM. UFS 3.1

  • Chipset: Exynos 2100 (5 nm)

  • Android: Android 11, One UI 3.1

  • Software Version: RP1A.200720.012.G991BXXU1AUB8

Battery Performance


The Samsung Galaxy S21 is classed as a flagship-tier device (around 800 EURO) in ViserMark list. The Samsung GalaxyS21 comes with the Exynos 2100 for the international market and the Snapdragon 888 for USA/China. The Exynos version was the one used during our tests; it offers 5G connectivity.

The Samsung Galaxy S21 test results, gave this Smartphone a ViserMark Battery Performance Score of 45. The Battery Performance Label being further from 100 indicates that this is not one of the best-performing phones. It has been ranked in 34th place of the best Battery Performance Smartphones as tested by SmartViser. It is powered by a 4000mAh battery; has a 25W fast charge feature, a 15W wireless fast charge and a 4.5W reverse charge option included.

Testing Results

BATTERY LIFE - Days of Use

Through the ViserMark testing protocol, the Samsung Galaxy S21 battery lasted almost 37 hours with a display refreshing rate of 120 Hz and 38.5 hours with 60Hz.

This Smartphone obtaining a obtaining a Battery Life score of 1.5 Days of Use.

The average ViserMark Battery Life score of a Flagship/Pro Tier Smartphone is 1.6 Days of Use. Being ranked 67, this score places the Samsung Galaxy S21 slightly above average within its tier.

CHARGING TIME - Hours and Minutes

To reach the full 100% the Charging Time was 1 hour and 13 minutes. The average Charging Time is 1:11 for a Smartphone within the ViserMark Flagship/Pro Tier.

  • Best Smartphone for Charging Times: Ranking #19

  • One of the Top 5 Flagship Tier Smartphones with the Best Charging Times

Test Graphics

Our testing is based on real smartphone usage from 100% battery level down to Power Off. When testing Smartphones, the testing protocol includes common daily life activities, for instance: Calls, Web, Video and Music streaming, Gaming, Social networks, Picture & Video capture and standby.

All testing is performed under strictly controlled test conditions with all activities being executed in a defined order and timeline.

Samsung Galaxy S21 Testing Graphics

There are a number of power-efficient processors, within today's Smartphones, that are able to cope with the growing number of new applications and can support high-resolution displays without compromising battery life.

Power Efficiency is calculated using Battery Life and Battery Capacity. This is expressed in “Leaves" and reflects a rating between 1 being least and 5 being the most power-efficient.

Samsung Galaxy S21 achieved an overall Power Efficiency Score of 1.5