You shouldn’t trust mAh together your sole guide to a phone v the longest battery life, it's a much more complicated picture.

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For the far better part that a decade, Robert has actually been writing about modern technology and trying no to overlook his miscellaneous unfinished gadget projects. He holds a BSc (Hons) in Sound engineering but also considers himself a self-taught boffin in displays, processors, wireless networking, and also pretty much any type of other hardware that's crammed into smartphones.
All-day battery life is a far-ranging checkmark because that any brand-new smartphone purchase. Here at Android Authority, we go to great lengths to check every handset’s battery life. Still, it’s every too basic to revolve to a spec sheet, look at the mAh listing and also make all sorts of assumptions based top top a solitary number. This sometimes leads to us being bamboozled by the lackluster battery life from a seemingly gigantic 4,000mAh cell or surprised at exactly how long a tiny battery inside phones favor the Pixel 3a or iphone phone SE have the right to last.

A phone’s mAh rating is a relatively meaningless statistic once taken top top its own. Battery life is in reality a highly complex picture, v a wide range of contributing hardware and also software variables. In this article, we’ll be digging into why girlfriend shouldn’t trust mAh together your sole overview to a phone through the longest battery life.

Buyers guide: Smartphones with the ideal battery life

What does mAh typical on a battery anyway?

The mAh abbreviation you find on battery spec sheets stands for milliampere-hour. This is a unit of electrical charge same to providing one milliamp of present (3.6 coulombs of charge) constantly because that one hour. A 1mAh battery can administer 1mA of existing for one hour, while a 1,000mAh battery gives 1mA of existing for 1,000 hours. However, a 1,000mAh battery offering 2mAh of existing will just last 500 hours. The course, smartphones don’t last hundreds or hundreds of hours since they draw much an ext than 1mA of existing from the battery. The more current attracted by her phone, the shorter the size of time the battery lasts.


Everything gift equal, a phone with a larger battery capacity will last much longer than a smaller one. However, this is rarely the case, as inner hardware and therefore power consumption varies so widely. Phone call A might consume 10%, 20%, or even 30% much more current than Phone B.

The distinct hardware and also software within each smartphone median that no two are ever alike. This is why simply understanding a battery’s mAh capacity doesn’t provide you any beneficial information about the supposed battery life at all.

Read more: The definitive overview to every little thing that affect smartphone battery life

Battery life vs mAh: Tested

Before we dive right into the “why” a little deeper, let’s do some testing! us ran a batch that phones with assorted specs and also battery capacities v our in-house rate Test G benchmark and recorded exactly how long that takes to drainpipe the battery. Rate Test G is a pretty brutal stress and anxiety test, so these results stand for the minimum display screen on time you have the right to expect from these smartphones. The results are arranged in ascending battery capacity.


There’s no clear and also obvious tendency from ours results. We can expect to see a around steady boost in battery life-time as capacity increased, but that no the case.

While our phones with gargantuan 5,000mAh and 6,000mAh cells offer some the the longest battery life-times under our excessive stress test, it’s actually the 3,700mAh Google Pixel 3a XL the lasts the longest here. This is all thanks to that lower-end specs, so nothing dismiss smaller batteries the end of hand! Similarly, there’s simply a few minutes difference between the 3,700mAh Pixel 4 XL and the 5,000mAh Asus Zenfone 6, highlighting that volume alone is not a insurance of lengthy or brief battery life.

Perhaps the most notable trend from our outcomes is the so countless phones actually fall in between the 3 hours 30 minutes and 4-hour note under hefty stress. This shows up to it is in the sweet point out that many manufacturers target, albeit with lot lighter processing workloads in mind. The 2,800mAh Google Pixel 4, 4,000mAh Galaxy S20 (Exynos model), and the 4,510mAh OnePlus 8 agree all autumn within simply a few minutes of each other.

Clearly, the different hardware specifications and also software functions strain their batteries in really different ways. Yet what specifically are those differences?

It all relies on what your phone is powering


The battery powers all the hardware inside your smartphone, native the processor to display and also any other functions packed into the handset. That lot is obvious, but different piece of hardware sucking down an ext or less juice. Low and also mid-range processors, because that example, consume much less power 보다 their flagship counterparts. Typically speaking, greater performance requires an ext power. This is regularly why affordable handsets regularly have much longer battery life than premium phones for any given battery capacity.

But as we’ve seen, also high-end flagships deserve to have an extremely different levels of strength consumption. View the instance with Samsung’s Exynos and Snapdragon Galaxy S20 flagships. Manufacturers can also under or overclock chipsets and even alter the CPU scheduler to hit their wanted performance and also power points.

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There space some excellent instances of extra hardware sucking down the battery juice too. The Google Pixel 4 and its Soli radar device is a prime example of a feature that drains much much more battery than a handset there is no it. Including a time-of-flight camera focusing system, an ext powerful stereotype speakers, or a 4K display all affect battery life. Even something look at as little as charging increase the S Pen on current Galaxy note phones to add up. These functions make handsets unique, yet they come through a price.

Manufacturers balance high performance and demanding hardware against all-day battery life, capacity, and also costs.

The tendency in quicker refresh rate display screens plays a huge part in why modern-day phones consume so lot power. This shows up to it is in why the Samsung Galaxy S20 series phones stick to 60Hz the end of the box, despite technically supporting 120Hz. The Pixel 4’s 90Hz setting is likewise linked to display screen brightness to conserve battery life. The reason being that the faster display screen content is refreshed, the an ext power the display and also phone’s processor consume.

Want much more examples? go you understand that the 4,300mAh OnePlus 8 through a 90Hz display gets better battery life than the 120Hz OnePlus 8 Pro through its bigger 4,510mAh battery? The 2 phones have otherwise virtually the same specs, highlighting just just how much that an impact displays and refresh rates have actually on battery life.

Battery life isn’t just a hardware factor to consider either. Smartphone software have the right to also impact battery life by killing off background apps to minimize CPU usage and wake-ups. For example, Huawei’s EMUI is notoriously more aggressive in this regard 보다 Samsung’s One UI.

5G is strength intensive


Another recent trend complicating the matter of mAh vs battery life is the launch of 5G. 5G modems and radio components require more power 보다 previous-generation 4G equivalents, an interpretation that your battery won’t go as far if she on a 5G network. Complicating points further, different 5G modems and chipsets drain different levels that power.

Related: best 5G phones you can buy and all the 5G phones coming soon

Mid-range chipsets with incorporated 5G modems, such together the Exynos 980 and also Snapdragon 765G, need to consume slightly less power 보다 the premium tier external modems used in flagship smartphones. This may be partially why phones choose the LG Velvet and also reportedly even the Google Pixel 5 are set to ditch Qualcomm’s power-hungry flagship tier chipset, the Snapdragon 865. Again though, these SoCs have actually slower top speeds, for this reason it’s another power versus performance trade-off.

The move to 5G hardware has undoubtedly boosted the need for bigger battery capacities. However, even if it is this is a critical purchasing consideration depends on whether you’re actually on a 5G or 4G network. If she sticking through a 4G tariff because that now, climate power intake from these components won’t be as high, and battery life should be more in line v previous generations. Again though, this all counts on other hardware. According to Redmi basic manager Lu Weibing, the relocate from 4G to 5G commonly consumes at least 20% an ext power. So you’ll require a approximately 20% bigger battery capacity to achieve the very same battery life as an indistinguishable 4G phone.

Looking the end for the best battery life

The vital takeaway from all of this is that structure a smartphone through all-day battery life isn’t as basic as choose the greatest battery possible. Manufacturers need to weigh up cost, space, and also the hardware they intended to power. The more feature-rich a handset, the tricker the balancing act. Most manufacturers shot to target a balance of hardware and battery volume that will acquire you through a complete day of usual use, and sometimes the doesn’t call for a large cell.

Our stress test doesn’t identify a straight correlation in between capacity and battery life since there no one. Bigger battery obviously provide much more power come play with, yet manufacturers’ underlying hardware choices have simply as big of an impact on actual battery life results.

Mid-range smartphones with less energy-hungry technology, such as the Pixel 3a, tend to get away with smaller sized batteries when still offering all-day battery life. In the premium segment, manufacturers use larger battery capacities (and the phones space bigger too) to power much more demanding technologies, like 5G, high refresh rate displays, or extra gaming performance.

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Of course, just how you usage your phone to add a entirety other layer come the battery life debate. Casual on facebook browsers are bound to end up with much an ext battery left in ~ the finish of the day 보다 mobile gamers.