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Samsung Galaxy M51 - Battery Performance Score

Updated: Feb 7


Battery Capacity mAh: 7000


Smartphone Battery Performance: Ranking #5

Placed No. 2 Smartphone for Battery Performance within the

Mid Tier Ranking Table


Battery Performance Testing and Review – July 2021



From the M family, the Samsung Galaxy M51 was the first Samsung device powered by a 7000mAh battery. The M51 is the most expensive device from its family, completing the massive battery, the device has a Super AMOLED panel and a Snapdragon Chipset.


Release Date August 2020

Product Features and Specification

  • · Design: Classic and resistant design.

  • · Rear Camera: 64 MP, f/1.8, 26mm (Wide), 1/1.73”, 0.8 µm, PDAF

12 MP, f/2.2, 123° (Ultrawide angle)

5 MP, f/2.4. (Macro)

5 MP, f/2.4, (Depth)

  • · Video: 4K@30fps, 1080@30fps.

  • · Selfie Camera: 32 MP, f/2.0, 26mm (Wide), 1/2.8”, 0.8 µm.

  • · Video: 4k@30fps, 1080@30fps.

  • · Battery: 7000 mAh (25W fast charge, 100% in 115 mins (advertised).

  • · Display: 6.7" Super AMOLED Plus.

  • · Size: 163.9 mm x 76.3 mm x 9.5 mm.

  • · Weight: 213g.

  • · Memory: 128GB ROM 8/6GB RAM, Micro SDXC (dedicated slot).

  • · Chipset: Qualcomm SDM730 Snapdragon 730G (8 nm): Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver); Adreno 618.

  • · Android: Android 10, One UI 2.5.


Battery Performance


With a price of around 400 EURO, the Samsung Galaxy M51 is classed as a Mid-Tier smartphone in the ViserMark ranking (Smartphones priced between 200-500 EURO). The Qualcomm SMD 730G Snapdragon 730G orchestrate the smartphone.

A 7000mAh battery powers the M51 to assure high autonomy. Compared with other Mid-tier devices, a higher refresh rate is a missing feature in the M51 that allows 60 Hz.

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

Based on the results, we have given this Smartphone a ViserMark score of 62. The Battery Performance Label, being nearer 100 indicates that it is one of the best-performing ones and has been ranked in 5th place of the best Battery Performance Smartphones as tested by SmartViser. The M51 additionally stands on the podium of Mid-Tier device's battery performance ranking just behind the Wiko View 5 Plus.


Testing Results

BATTERY LIFE - Days of Use

The Samsung Galaxy M51 reached around 82 hours of autonomy through the ViserMark test protocol with a 60 Hz refreshing rate, obtaining a Battery Life score of 3.5 Days of Use.

The average Day of Use ViserMark score of a Mid-Tier device is “2” Days. The M51 score places the Smartphone at the Top of the ViserMark Mid-Tier ranking in terms of autonomy sharing the first position with the Wiko View 5 plus.


CHARGING TIME - Hours and Minutes

The charging time to 100% was one hour and forty-seven minutes, with the 25W fast charge option included, this value is even 8 minutes slower than the 115 minutes advertised by Samsung.

The average Charging Time is 1:36 for a Smartphone within the ViserMark Mid-Tier. This score places the M51 in the middle of the charging time ranking, a higher power charger could be an option to get a faster charge considering the device’s battery size.

  • Currently in the middle of the 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.

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

Wiko Power U20 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 the least and 5 being the most power-efficient.

The Samsung Galaxy M51 achieved an overall Power Efficiency Score of 1.5, placing the device in the middle of the ViserMark ranking in terms of Power Efficiency.



With an overall Battery Performance Score of 62, the Samsung Galaxy M51 has reached 5th position in ViserMark ranking for being the best Smartphone with the Best Battery Performance.

Compared with other Mid-Tier Smartphones the M51 performance is just behind the Wiko View 5 Plus but superior to all other Mid-tier devices in the ViserMark ranking. It is an expected result in terms of autonomy as the M51 is housing the biggest battery in the ViserMark list.

In conclusion, the Samsung Galaxy M51 guarantees high autonomy given its 7000mAh battery, there are still points of improvement in terms of battery efficiency and charging time that could place a device of the same family on top of ViserMark battery performance ranking.


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) - not available at present.

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.


See More Reviews



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.


Latest Reviews

If you're looking for the best smartphone on the market, battery performance is one of the critical 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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