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  • Daniel Chaparro

Samsung Galaxy A51 - Battery Performance Score

Updated: Oct 12, 2022

Smartphone Battery Performance: Ranking #64

Placed No. 15 Smartphone for Battery Performance within the

Mid Tier Ranking Table


Battery Performance Testing Report and Review – March 2021




The Galaxy A51 comes as the evolution of the A50 model, it is a Samsung update for a mid-range price Smartphone, that already succeed in 2019 with the A50.

Most changes in the A51 are related to updated hardware and a modern design, the A51 model has a 4/6 GB RAM memory and 64/128 ROM memory and the possibility to extend it up to 500 GB.


Release Date January 2021

Product Features and Specification

  • Design: Plastic refined and stylish design.

  • Camera: 32 MP Front camera, f/2.2 26mm (wide),1/2.8”, 0,8µm

Quad 48 MP rear camera, f/2.0, 26 mm(wide) ½.0", 0.8µm, PDAF;

12 MP rear camera, f/2.2, 123" (Ultrawide);

5 MP rear camera, f/2.4 (macro);

5 MP rear camera, f/2.2 depth.

Video capture: 4K@30fps, 1080p@30fps

  • Battery: 4000 mAh (Fast charging 15W)

  • Display: 6.5"

  • Size: 158.5 x 73.6 x 7.9 mm

  • Weight: 172g

  • Memory: 64/128GB.

  • RAM: 4/6GB

  • Chipset: Exynos 9611 (10nm).

  • Android: Android 10, upgradable to Android 11, One UI 3.0

  • Software Version: QP1A.190711.020.A515FXXU4CUA1


Battery Performance



The Samsung Galaxy A51 is classed as a Mid Tier smartphone in the ViserMark ranking (Smartphones priced between 200-500 EURO). It is equipped with the Exynos 9611 Chipset and has a battery capacity of 4000 mAh battery with a 15W Fast Charge option.

The overall Battery Performance Score is now a global score taking calculations from Battery Life, Power Efficiency and Charging Times.

From the Samsung Galaxy A51 test results, we have given this Smartphone a ViserMark score of 39. The Battery Performance Label, being lower than 50 indicates that it is one of the lower-performing Smartphones and has been ranked in 64th place of the Battery Performance Smartphones as tested by SmartViser.


Testing Results

BATTERY LIFE - Days of Use

The Samsung Galaxy A51 reached around 37 hours of autonomy through the ViserMark test protocol with a 60 Hz refreshing rate, obtaining a Battery Life score of 1.5 Days of Use.

The average Day of Use ViserMark score of a Mid Tier smartphone is “2” Days. This score places the Samsung Galaxy A51 Smartphone is lower than the ViserMark Mid Tier ranking.


CHARGING TIME - Hours and Minutes

The charging time to 100% was 2 hours and 14 minutes. This Smartphone has a built-in fast charging feature included.

The average Charging Time is 1:36 for a Smartphone within the ViserMark Mid Tier. The Samsung Galaxy A51 makes it to 47th place of the Battery Charging Times for Smartphones.


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.

Figure 1. ViserMark Battery Life Test at 60 Hz refresh rate

Samsung Galaxy A51 Test 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 A51 achieved an overall Power Efficiency Score of 1

  • Best Smartphone for Power Efficiency: Ranking #71




The battery autonomy of the Samsung Galaxy A51 is offering 1.5 days based on the ViserMark Test Protocol. The Samsung Galaxy A51 performance is far from expectations. Other devices in the same price range with a similar battery capacity performed better. As an example, Reno 4Z 5G with a performance score of 44 or the Sony L4 with a score of 45 (with a 3580 mAh battery capacity).


ViserMark tests are performed with the strictest protocol in a controlled environment to ensure repetition and consistency 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.


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 smart-phone camera industry. We appreciate your interest in VCX-Forum.

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The Samsung Group is a South Korean multinational conglomerate headquartered in Samsung Town, Seoul. It comprises numerous affiliated businesses, most of them 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.


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If you're looking for the best smartphone on the market, battery performance is one of the key decisive aspects then ViserMark is for you.

Not only is ViserMark the first label that measures battery performance translating mAh into direct battery life scores, but it is also a highly valuable 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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