• Daniel Chaparro

OnePlus 9 - Battery Performance Score


Battery Capacity mAh: 4500

Smartphone Battery Performance: Ranking #51

In the lower half for Battery Performance within the

High Tier Ranking Table

Battery Performance Testing and Review - October 2021


In previous years OnePlus has launched two high tier devices, the OnePlus 8 and the OnePlus 8 Pro. The OnePlus 9, and the OnePlus 9 Pro arrive as evolved versions of these past Smartphones. The OnePlus 9 offers high-tier features while keeping a lower price than its big brother, the OnePlus Pro.

Release Date March 2021

Product Features and Specification

· Design: New camera-based design

· Rear Camera: 48 MP, f/1.8, 23mm (Wide),1/1.43”, 1.12µm, Omnidirectional, PDFA

50 MP, f/2.2, 14mm (ultrawide), 1/1.56”, 1.0µm, AF

2 MP, f/2.4 (monochrome)

· Video: 8K@30fps, 4k@30/60 fps, 1080@30/60/240 fps, Auto HDR, gyro-EIS

· Selfie Camera: 16 MP, f/2.4, (wide), 1/3.06”, 1.0µm

· Video: 1080@30fps, gyro-EIS

· Battery: 4500 mAh (65 W fast charge, 1-100% in 29 mins advertised)

· Display: 6.55" Fluid AMOLED, 120 Hz

· Size: 160 mm x 74.2 mm x 8.7 mm

· Weight: 192g

· Memory: 128GB ROM 8GB RAM, 256GB ROM 12GB RAM

· Chipset: Qualcomm SM8350 Snapdragon 888 5G (5 nm)

· Android: Android 11, OxygenOS

Software Version: LE2113_22_210708

Battery Performance


The OnePlus 9 is classed as a High-Tier device in the ViserMark ranking table, (Smartphones priced between 500 and 700 EURO), with a price just over 500 EURO. The OnePlus 9 is powered by the Qualcomm Snapdragon 888 5G chipset offering 5G connectivity. To assure enough autonomy a 4500 mAh battery powers the device.

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

Based on various test results, we have given this Smartphone a ViserMark score of 47. This score places the Smartphone device in the middle part of ViserMark overall ranking, 21 points below the leader. However, compared with other high tier devices, the OnePlus performance is just 3 points below the High-tier champion.

Testing Results

BATTERY LIFE - Days of Use

The OnePlus 9 autonomy was over 37 hours with a 120 Hz refreshing rate compared with the 38.5 hours with a 600 Hz refreshing rate.

Based on the ViserMark test protocol, The OnePlus 9 device achieved a score of 1.5 days.

The average Day of Use ViserMark score of High-Tier devices is “1.6” days which places the OnePlus 9 just slightly below the average score.

  • Best Smartphone for Days of Use: Ranking #51

CHARGING TIME - Hours and Minutes

The charging time to 100% was 32 minutes, with the 65W fast charge option included. A performance very close to the 30 mins advertised by OnePlus.

The average Charging Time is 1:10 for a Smartphone within the ViserMark High-Tier ranking. Given its results, the OnePlus 9 has become nearly the fastest High-Tier device in terms of charging time.

  • Quickest Smartphone for Charging: Ranking #2

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.

The OnePlus 9 obtained an overall Power Efficiency Score of 1, the average score for

High-Tier devices is 1.2, the OnePlus 9 stands in the low part of the Power Efficiency ViserMark ranking table.

  • Best Smartphone for Power Efficiency: Ranking #86


In conclusion, the OnePlus 9 offers an average battery performance, with superb charging time for other devices to compete with. The OnePlus 9 Smartphone autonomy offers an average performance of 1.5 days and its Power Efficiency score is slightly underperforming. However, this Smartphone charged to 100% in 32 minutes, making this the fasting charging Smartphone within the ViserMark reviews.

Compared with other High-Tier devices, the OnePlus 9 is behind competitors such as the Huawei P40 Pro and Google Pixel 5 in terms of autonomy. Interestingly, it also remains behind its previous Smartphone generation (OnePlus 8) which offered 2 days of Battery Life, however, the OnePlus 9 does offer a faster charging time.

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.