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  • Daniel Chaparro

Samsung Galaxy S21 - Smartphone Battery Performance

Updated: Nov 10, 2023

Innovations for the Samsung Galaxy S21, plus new camera technology


Battery Capacity mAh: 4000

Battery Performance icon

Smartphone Battery Performance: Ranking #54

In the Top 5 for Battery Performance within the


Battery Performance Testing and Review – March 2021

ViserMark Label for battery performance with 45/100


As the new S family member, 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 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 a flagship-tier device (around 800 EURO) in the ViserMark list. It comes with the Exynos 2100 for the international market and the Snapdragon 888 for the USA/China. The Exynos version was 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 among the best Battery Performance Smartphones tested by SmartViser. It is powered by a 4000mAh battery. The Samsung Galaxy S21 has a 25W fast charge feature, a 15W wireless fast charge, and a 4.5W reverse charge option.


Testing Results

ViserMark Label for Battery Life indicating 1.5 Days of Use

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 has 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.

ViserMark Label for Battery Charging indicating 1h13

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.

Smartphone charging time icon

  • 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 smartphone usage from 100% battery level down to Power Off. When testing Smartphones, the testing protocol includes everyday life activities, for instance, Calls, Web, Video and Music streaming, Gaming, Social networks, Picture and video capture and standby.

All testing is performed under strictly controlled conditions and executed in a defined order and timeline.

Samsung Galaxy S21 battery performance test results

Samsung Galaxy S21 Testing Graphics

SmartViser Logo
ViserMark Label for Battery Efficiency indicating 1.5/5 leaves

Several power-efficient smartphone processors can cope with the growing number of new applications and 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 the least and 5 being the most power-efficient.

Samsung Galaxy S21 achieved an overall Power Efficiency Score of 1.5

Smartphone battery efficiency icon

  • Best Smartphone for Power Efficiency: Ranking #63



The battery autonomy of the Samsung Galaxy S21 is around 1.5 days, based on the ViserMark Test Protocol. It is lower than its predecessor, the S20 (2 days). However, the Samsung Galaxy S21 has a smaller battery (500mAh less). Also, compared to other flagship devices, its performance is similar to that of the Pixel 4XL (182) and the OPPO X2 Pro (183).


ViserMark tests are performed with the strictest protocol in a controlled environment to ensure repetition and consistency. They are powered and automated by SmartViser’s test automation solution viSer. The automation test includes a variety of user actions, from calls to social media and periods of standby times.

A button for Samsung Galaxy S21 smartphone specifications

VCX (Valued Camera eXperience)

The VCX Forum has been working with its members on the system and infrastructure as a non-profit organisation. We strive to improve our technology to develop and exchange accurate and objective quality and performance indicators that are our ultimate goal. We will also serve as a compass for the smartphone camera industry. We appreciate your interest in VCX-Forum.

VCX Camera Score 65/100

Samsung Galaxy S21


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The Samsung Group is a South Korean multinational conglomerate headquartered in Samsung Town, Seoul. It comprises numerous affiliated businesses, most united under the Samsung brand. Samsung Electronics has assembly plants and sales networks in 74 countries and employs around 290,000 people. Samsung is a major manufacturer of electronic components such as lithium-ion batteries, semiconductors, image sensors, camera modules and displays for clients such as Apple, Sony, HTC and Nokia.


Latest Reviews

If you're looking for the best smartphone on the market, battery performance is one of the vital decisive aspects. Review all the smartphones that ViserMark have tested so far.

Not only is ViserMark the first label that measures battery performance, translating mAh into direct battery life scores, but it is also a precious marketing asset to device manufacturers and end-users. ViserMark is a benchmark to help make better-informed choices when buying a Smartphone. 

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If you are a Smartphone manufacturer looking to improve your Smartphone's battery Performance, don't hesitate to contact us to discuss how we can help you.

If you are a Smartphone Manufacturer looking to improve your Smartphone's battery Performance, don't hesitate to contact us to discuss how we can help you.

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