Which smartphone has the longest battery?

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According to a study by Statista from January 2018, smartphone users want one thing above all for their next device: a significantly longer battery life. No problem. We are showing 10 mostly very cheap smartphones that last a particularly long time on one charge.

But even if the battery capacity is a very important indicator of a long battery life, there are other factors such as the display, processor, software and usage behavior that have a significant impact on the value. The best example that you can achieve decent runtimes with a relatively low battery capacity has been Apple's iPhones for years.

The battery of the current iPhone SE (the most important accessory) only has 1821 mAh. Thanks to the small 4.7-inch display, an economical processor and perfectly coordinated software, much more is not necessary to get the user through the day. Meanwhile, Apple is also installing (hot) thick batteries in its smartphones with 3969 mAh in the iPhone 11 Pro Max. This is mainly due to the very large 6.5-inch display in the iPhone 11 Pro Max.

We want to find out which smartphones actually run the longest on one charge. For this we look at the results of the PCMark benchmark Works 2.0 Battery Life. PCMark lists almost 1400 Android phones there. The first 10 places are the focus of this article and we give an assessment of the respective devices as to whether they are worth buying.

With its 13,000 mAh battery, the Ulefone Power 5 is the king of batteries among Android smartphones. But it also weighs a crisp 331 grams - weightlifters will be happy. Its dimensions of 79 × 169 × 16 millimeters are anything but slim. It is (like most of the here) OTG-capable and even supports the Qi charging standard (Qi charger list of the best). Irritating: One of the two rear cameras is fake. The Ulefone Power 5 is now a bit older, it came on the market in mid-2018. At least it got an update to Android 9, buyers shouldn't expect more. There is now a Ulefone Power 6, but it comes with a "meager" 6350 mAh battery.

The Blackview BV9100 also has a huge battery with 13,000 mAh. At 408 grams and measuring 171 × 80 × 19.5 millimeters, the outdoor smartphone is even heavier and thicker than the Ulefone Power 5. In addition to the large battery, the Blackview BV9100 is also characterized by its high resistance. It comes with an IP68 certification and has passed tests in accordance with MIL-STD-810G. The device has been available for purchase since the end of 2019 and it comes with Android 9. It may receive an update, but we wouldn't expect it. Nevertheless, due to its younger age, we can recommend it more than the Ulefone Power 5.

In addition to the additional letter, the Ulefone Power 5S only differs marginally from Power S. It is about six months younger, offers only 4 instead of 6 GB of RAM and comes in a fresh color: gray.

4. Xiaomi Redmi Note 9 Pro

The Xiaomi Redmi Note 9 Pro is a big surprise at this point. Because even if the Xiaomi Redmi series stands for battery power, it was hardly to be expected that a smartphone with a 5000 mAh battery would push itself in front of devices with more than twice the capacity. We suspect that the placement is just a snapshot. Because the Redmi Note 9 Pro is so fresh that its distribution is still very low. It is possible that only a few PCMark benchmarks have been made, which are therefore not yet representative. However, if the Redmi Note 9 Pro can claim its very good fourth place, we will give it a clear purchase recommendation for everyone who is looking for a handy device with the longest possible battery life.

The PCMark battery test only measures the runtime, nothing else. This is the only reason why smartphones like the Poptel P9000 Max with its 9000 mAh battery can stay there for so long. Because it has been on sale since the beginning of 2018 and in most respects cannot keep up with current, equally priced smartphones. Except for the battery life, obviously. Nevertheless, we do not recommend buying it. It originally comes with Android 7.

Prize question: How much capacity does the Doogee BL12000 battery have? 12,000 mAh? Wrong, 10,000 mAh. Why you want to mislead the user with a very high battery capacity in the product name remains the secret of Doogee. Even if the Doogee BL12000 makes a very good paperweight and, thanks to OTG support, a good power bank, we cannot recommend the device due to its old age. It saw the light of day at the end of 2017.

Prize question: How much capacity does the Doogee BL12000 Pro's battery have? 12,000 mAh? Correct! In contrast to the BL12000, Doogee packs in the Pro version what the name suggests. However, this makes it even more incomprehensible why it does worse than its little brother in the PCMark benchmark. Basically, it doesn't matter, because the same applies as for the BL12000: Great paperweight, good OTG battery bank but much too old to be recommended to buy.

And another old thing: The Blackview P10000 Pro from mid-2018 has an 11,000 mAh battery and is therefore fully trimmed for endurance. Nevertheless, you shouldn't buy it because of its old age.

With the Ulefone Armor 3W, a current device from the end of 2019 finally makes it into the top 10. It is robust, waterproof, has the Helio P70 processor with 6 GB of RAM and, above all, a large 10,3000 mAh battery. The real representative of an outdoor smartphone could find many friends if you can cope with the very high weight of 358 grams.

The Oukitel K10 would basically be a passable smartphone: It has an immense 11,000 mAh battery, thanks to OTG it can also charge third-party devices with it. In addition, it is comparatively slim and not particularly heavy at 204 grams. The performance is also sufficient for a mid-range device. However, what it sidelines like so many other smartphones in this top 10 is its old age of over two years.

According to the results of the PCMark Benchmark Work 2.0 Battery Life, the top 10 smartphones with the best battery life are exclusively mid-range devices that are in most cases much too old. That's why we picked out five current flagships with the Samsung Galaxy S20 Ultra, the Huawei P40 Pro, the Huawei Mate 30 Pro, the Xiaomi Mi 10 Pro and the Oneplus 8 Pro and sorted them according to the PCMark benchmark.

74. Xiaomi Mi 10 Pro (review to follow), 4500 mAh

Particularly interesting here is the unexpectedly poor performance of the S20 Ultra, after all, of all the models compared here, it has the nominally highest capacity with 5000 mAh. But especially on the S20 Ultra it can be shown very well that there are other factors that have a strong influence on the battery life. In the case of the Samsung flagship, it's the processor. The in-house Exynos 990, with which the device is sold in this country, seems to have a significantly weaker energy management than the Snapdragon 865, with which the device is sold in the USA, among others.