Smartphones can be very different but we all want long battery life. With modern features such as dazzling displays, it can be hard to come by so sadly the days of charging once a week are long gone. However, there are a number of phones that can easily last day or even two.
And hey, we’re all probably just staring at our phone screens for too long. Phones - and therefore batteries - are pretty small!
That’s why at Tech Advisor we test the battery life of all the phones we review. Some phones are designed to have extra-long battery life by using large batteries and mid-range processors. But other popular high-end models are slim and battery hungry and leave some users frustrated.
You can of course charge during the day if it doesn’t bother you or even carry around a power bank to top up your phone. But if you don’t want to keep checking that percentage icon, then there are some phones that you should look to.
We review and test many phones. The below list are the ten phones that most recently have given the best battery performance.
Battery Capacity Explained
Battery capacity is measured in milliamp hours (mAh). The higher the mAh of a battery, the higher the technical capacity. But the phones with the highest mAh aren't always the phones with the best battery life.
It can depend on how efficient the processor is in conjunction with the software, as well as how much you actually use your phone. Expensive high-end phones often are faster and have better screens, but this will mean the battery life is normally shorter.
What To Look Out For
Phones with great looking QHD displays will drain battery life faster than phones with lower resolution displays. So you need to prioritise - if you want longer battery life, you might have to settle for a mid-range phone. Thankfully, this means your phone will cost you less.
Many phones today, but not all, have fast charging. Often cheaper mid-range phones have great battery life, but don't fast charge. Check before you buy to avoid disappointment.
What Do The Results Show?
We use Geekbench 4’s battery test feature to get the time in minutes and seconds, but this is not an indication of how long the phone will actually last.
In all tests, the screen brightness is set to the same level to ensure a fair test (120cd/m2). The phone fully discharges its battery and the screen is set not to dim or turn off.
For example, if a phone lasts 8:15 in a test, it lasted 8 hours and 15 minutes with the screen on and the test processes running. This example is a very good ‘screen on time’ - and that phone will last a very long time in real world use, most likely over a day's use.
As well as the Geekbench test, we also confirm with real-world use that these phones had excellent battery life that lasts throughout a day of use and beyond. We have ranked them on the Geekbench result here.
The star scores here are the scores we gave the phone overall in the original review, not star rating scores for battery life alone. As we test more phones, we’ll update the chart.
Best Battery Phones 2020
1. Xiaomi Redmi Note 9S
- $219 (64GB), $249 (128GB)
- Battery test score: 15:03
- Battery size: 5,020mAh
The Redmi Note 9S' key selling point is its 5,020mAh battery. With some budget- to mid-range hardware inside, along with a large (6.67in) but only Full-HD+ screen and the Snapdragon 720G processor, it was able to put in the longest recording we've ever seen in the Geekbench 4 battery life test.
Though its battery life excels, this remains a budget phone (right now you can pick it up under £200 at GearBest), so you won't find support for wireless charging. It is otherwise a great all-rounder at this price.
Wired charging is fast - at 18W over USB-C - and a 22.5W charger is supplied in the box, which enabled us to get from 0 - 36% in 30 minutes.
2. Moto G7 Power
- $249
- Battery test score: 14:02
- Battery size: 5000mAh
It's even in the name and the point of the phone - the Power is built for exactly that, and will last most people a solid two, if not three days use.
It's underpowered and won't run high-end games or multitask very well, but if battery life is your primary smartphone concern then there are no better phones for you than this.
Pick it up for just £129.95 right now.
3. Xiaomi Mi Note 10
- $549
- Battery test score: 13:13
- Battery size: 5260mAh
The Mi Note 10 is a great phone for many reasons and battery life is certainly one of them. This is one of the best results we've ever seen.
You'll also benefit from 30W wired charging which gets you to 80% in 40 minutes, and fully charged in just over an hour. Impressive stuff.
4. Vivo Nex 3
- From 4998RMB (about $700)
- Battery test score: 13:00
- Battery size: 4500mAh
Lasting 13 hours in our battery test would be impressive from any phone, but from one powering a giant full-screen curved pOLED display and 5G modem at the same time it's genuinely remarkable.
With 8GB RAM, 256GB storage and a Snapdragon 855+ processor the Vivo Nex 3 doesn't skimp on specs at all, meaning there's some serious battery optimisation going on under the hood - but however it works, it means two-day battery life from a stunning, powerful flagship phone, which is nothing to be sniffed at.
5. Motorola One Zoom
- TBC
- Battery test score: 12:58
- Battery size: 4000mAh
You'll also get the benefit of quick charging as the included 18W adapter will allow you to charge the One Zoom to 23% in just 15 minutes. Pretty good for a cell of this size.
6. Asus ROG Phone 2
- $899
- Battery test score: 12:56
- Battery size: 6000mAh
The mamoth 6000mAh battery lasts an incredibly long time and it also has more tricks up its sleeve including 30W charging - where we got 44% in 30 mins despite the size of the cell - and reverse charging so you can top up other devices when needed.
7. Oppo A9 2020
- £219.99 (around $285)
- Battery test score: 12:53
- Battery size: 5000mAh
Despite being a budget phone, the Oppo A9 2020 manages to weigh in as one of the best phones when it comes to battery longevity.
The Oppo A9 2020 comes with 4GB RAM, 128 GB of internal storage, a Qualcomm Snapdragon 665 processor and a quad camera with a 48MP main lens, which comes with a very impressive night mode. There are a few niggles with the phone, but the massive battery life and low price make up for this.
8. Oppo Reno 10x Zoom
- To be confirmed
- Battery test score: 12:32
- Battery size: 4065mAh
The phone also boasts a large 6.6in AMOLED screen, up to 12GB of RAM and, of course, that 10x hybrid zoom feature.
9. Oppo A5 2020
- £179.00 (around $232 dollars)
- Battery test score: 12:32
- Battery size: 5000mAh
Also coming in at the same time as the Reno 10x Zoom is the A5 2020. At £179.99, it's one of the most affordable phones on this list.
Alongside that big battery life, you also get a classy exterior design and a big display. Of course the quad camera doesn't quite match up to it's rivals - with just a 12Mp main lens. However, these downfalls don't quite detract from what is a powerful entry-level phone.
10. Fairphone 3
- €450
- Battery test score: 12:27
- Battery size: 3000mAh
It might only have a average sized battery but it's less demanding specs mean that it can keep going for a lot longer than a typical smartphone these days.
There's also something extrememly rare on offer here becuase the battery is removable and therefore replaceable with minimal hassle, just like the old days.
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