The battery capacity of Galaxy Note 9 is 4000 mAh, which is awesome, even within in its category. Only the P20 Pro can match it. Another interesting fact is that the Note 9 is 4% larger than Note 8, but it has 17% more battery capacity.

Battery life is one of the most sought-after features of a smartphone. A key factor is undoubtedly the battery capacity — especially within the same ecosystem (Android, iOS or other). Battery life can be affected by a great many factors, but the main ones are the main processor aka SoC, display and wireless radios (LTE broadband, WiFi, the cell towers location and more).

It is not possible to accurately estimate through synthetic tests how much energy drain YOUR unique needs will generate. However, two things are surely always good:

  • A larger battery capacity
  • Faster charging

The S9+ didn’t particularly impress us with a charging speed of 42 mAh/mn, and neither does the 45 mAh/mn of the Galaxy Note 9, which is considered normal for high-end phones. Competitors can go as high as 62 mAh/mn (Huawei P20 Pro) or 67 mAh/mn (Oneplus 6) which is quite extraordinary.

It is generally not possible to predict real-world battery life by running synthetic benchmarks. Things such as display brightness, (LTE/WiFi) radio usage and distance to access points will change too much. Also, the number of apps installed and their usage is unpredictable. Battery capacity is the most important battery-life indicator for YOUR usage.

The Galaxy Note 9 has a very large battery, but if that’s the main thing you are looking for, keep in mind that you can get a lot of battery for your money with other models.

Wireless charging can be very handy, and the Galaxy Note 9 comes with an integrated wireless charging. This charging method is ideal for users who are a lot of time at a desk. It is also convenient for overnight charging, and it is even possible to install a wireless charger in your car. You can add wireless charging via add-on cases if it does not come integrated into your handset but it is not the option we recommend.

This product does not have a removable battery, which is the norm for handsets these days. Fixed batteries cant be swapped or easily repaired, but they do allow for more compact designs and slightly larger battery size within the same product volume

Since this phone has a very large screen, keep in mind that larger displays tend to utilize more energy due to the larger surface area to illuminate. It depends on the brightness levels screens are being used at, but the potential for higher energy is there, so greater battery capacity is better.

This device has a very high-resolution display (2960×1440). This is great to show extremely crisp images, but handling 2.19M pixels more than a 1080p/FHD (2M pixels) screen will require a bit more power from the battery. Fortunately, it is possible to reduce the rendering resolution.

Filed in Cellphones >Reviews. Read more about Editorspick, Galaxy Note 9, Samsung, Samsung Reviews and Smartphone Reviews.

514 PPI
~$999 - Amazon
12 MP
F1.5 Aperture F-Stop
201 g
4000 mAh
Wireless Charging
Launched in
Snapdragon 845 + MicroSDXC
Storage (GB)
64, 128, 512
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