Which smartphone has the best battery life today?

Currently, most high-end smartphones are equipped with batteries with capacity of more than 3,000 mAh. But when the screen is getting bigger and demand is high, this number doesn't seem to be enough for users. Therefore, the phone manufacturers are trying to equip larger batteries for their products.

However, the deciding factor for battery life is not only in the mAh number but also depends on the combination of software and hardware to optimize that number. PhoneArena, has measured the use of mAh battery on the phone battery to help users have a more specific look.

PhoneArena uses the formula below to get a parameter that shows how long each phone will work if all has the same battery capacity.

Normal battery life = [(battery life (minutes) / battery capacity (mAh)] x average battery capacity of the device group

For example: LG V30 is equipped with a 3,300 mAh battery, the battery life is 574 minutes, the average battery capacity of the group is 3,388 mAh. Applying the above formula will have:

The normal battery life of LG V30 = (574/3300) x 3388 ~ 589 minutes, equivalent to 9.82 hours.

PhoneArena divides the result into two groups: The device group has a screen resolution of 2K or more (group 2K +) and the group has a screen resolution of less than 2K (group less than 2K).

The normal battery life of the 2K + group with an average battery capacity of 3,388 mAh.

The group's normal battery life is under 2K with an average battery capacity of 3,115 mAh.

From the data in the two tables above, we can see, the 2K + group has a larger average battery capacity but they have a 20% lower battery efficiency than the group of less than 2K. In addition, the battery life of a device with a lower screen resolution may be about 20% better than a device that uses a 2K screen if two devices have the same battery capacity.

The screen is the most energy-consuming part. 2K screen (size 2560x1440 pixels) has twice as many pixels as the Full HD screen. Therefore, devices with high-resolution screens will have lower battery performance.

However, some phone companies have done a good job combining hardware and software to produce products that both have high screen resolution and good battery performance. For example, in the 2K + group is the HTC U11 or Samsung smartphones using Exynos and iPhone chips in the group under 2K.

PhoneArena's results are based on figures made from measurements under standard conditions, so they are for reference only.

However, PhoneArena's ranking also shows that phones with longer battery life do not mean that it is optimized for better hardware and software. And at the same condition, the 2K + screen will cost more battery than the Full HD screen.

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