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iPhone 17 vs. iPhone Air Battery Test Showdown: I Just Crowned A New Winner

I’ve got exclusive CNET data for three years of iPhone models. See how the latest phones rank historically.

Key takeaways:

  • The iPhone 17 Pro Max has outstanding battery life that easily lasts all day with charge to spare.
  • Our exclusive lab data shows you don’t need to pay over a grand for excellent battery life. The $829 iPhone 17’s battery lasts just as long as the $1,099 iPhone 17 Pro.
  • The ultrathin iPhone Air, with a modest battery capacity, outlasted Samsung’s premium Galaxy S25 phones.

I’ve been reviewing smartphones at CNET for nearly a decade. If there’s one feature people consistently want in a new iPhone or Android phone, it’s longer battery life. 

When Apple launched the new iPhone 17 series and iPhone Air, it spent considerable time touting the longer battery life of the iPhone 17, 17 Pro, and 17 Pro Max, as compared to their predecessors. 

My fellow CNET reviewers and I have now had the chance to test those claims.

When introducing the iPhone Air and its super slim design, Apple showed a slide during its keynote stating that it has all-day battery life. However, the company undercut its claim on the next slide when it announced a new MagSafe battery pack designed for the Air, which fed into fears that a thinner design might indicate a significant sacrifice to battery life.

Your phone’s battery life is affected by multiple variables, like how bright you keep your display or if your phone has a weak signal from your carrier. How you use your phone has a big impact, too. Someone who is obsessively online will have a much different experience with their battery life than someone who has their phone in their bag at work and checks it on breaks.

So, how do you know whether the battery life is good on the iPhone Air and iPhone 17 series?

CNET tested the new Apple phones’ battery life three ways: through an anecdotal stress test, a video streaming test and observing battery life after everyday use. We also tested wired and wireless charging. Our lab data showed strong battery life for the iPhone 17, 17 Pro, 17 Pro Max and even the Air, especially compared to older iPhone models.

The iPhone 17 Pro Max has excellent battery life

Bigger batteries don’t always mean superior battery life. There’s more to battery life than the physical size or capacity. Besides Huawei, Apple is the only major smartphone maker that builds its own hardware and software and can tune its phones to work off smaller batteries than most Android phones have. 

The iPhone 17 Pro and 17 Pro Max have larger batteries than last year’s 16 Pro and 16 Pro Max. If you’re using an eSIM-only version of either phone, like the iPhone models sold in the US, your battery is even bigger because it takes up the space where the SIM card tray would be.

Frustratingly, Apple doesn’t share the capacity of the iPhone’s batteries, and part of the reason is that its batteries are often smaller than those in Android phones. Fortunately, the EU requires that Apple publish energy labels that include the capacity of its batteries on its site. Macrumors found the capacities for eSIM-only models. You can see how the new phones’ batteries compare to the ones in the iPhone 16 series:

  • iPhone Air: 3,149 mAh
  • iPhone 17: 3,692 mAh
  • iPhone 17 Pro: 4,252 mAh
  • iPhone 17 Pro Max: 5,088 mAh
  • iPhone 16: 3,561 mAh
  • iPhone 16 Plus: 4,674 mAh
  • iPhone 16 Pro: 3,582 mAh
  • iPhone 16 Pro Max: 4,685 mAh

CNET has two benchmark tests (video streaming and stress tests) that allow us to compare the battery performance of one phone against another. And because we’ve been using these tests for years, we can also compare a new phone against older models. 

For example, if you have an iPhone 15 and are considering upgrading to an iPhone 17, we can tell you that the new iPhone will have a longer battery life out of the box than your old one.

In CNET’s 3-hour video battery test, where we streamed a video over Wi-Fi with the screen at full brightness, the iPhone 17 series did terrific, even if the results were not dramatically better than the iPhone 16 series.

Without a Plus model this year, the iPhone 17 Pro Max is the only model with a big battery (the biggest one ever in an iPhone), and it only lost 9% in the test. The lower the percentage lost, the better. This is the first time an iPhone stayed in single digits, and I should note that the 17 Pro Max tied the Motorola Razr (2024) for the best score since we’ve been running the test. The Razr has a less powerful processor and a smaller main screen with a lower resolution and less brightness.

The iPhone Air and 17 Pro dropped 15% in the test, the same as the iPhone 15. And the iPhone 17 lost only 11%, better than the iPhone 15 and 16.

Something to keep in mind is that the iPhone 17 has a 6.3-inch screen that supports a 1-120Hz variable refresh rate and a max brightness of 3,000 nits, compared to the iPhone 15 and 16, which have a 6.1-inch display with a 60Hz refresh rate and a max brightness of 2,000 nits.

The new Apple phones did well in CNET’s 45-minute endurance test, during which I played games, streamed videos, scrolled social media and took a video call. The 17 Pro Max only dropped a single percent, the best result this year, but behind the iPhone 16 Plus, which stayed at 100% (the best result for any phone).

The iPhone 17 and 17 Pro had the same result, dropping 2%, making the standard iPhone 17 look even more like an incredible value. The iPhone Air dropped 5%, which matches the iPhone 15 in the same test. For perspective, the Air did better in this test than the Samsung Galaxy S25 series and tied with the Motorola Razr Ultra.

The iPhone Air gets through a day

When we review phones, we set them up as our daily driver to use and test them like our personal phones. Real-world testing is often the best indicator of what a reader can expect to get from a phone.

I started each day with a full battery for the iPhone 17 Pro and 17 Pro Max and tracked how much battery I had throughout the day. I ended each day with plenty of battery left — even after shooting photos and videos or keeping the screen at full brightness while filming the review video. Below is a chart that shows how the iPhone 17 Pro Max’s battery performed for the first five days I had it.

Similarly, CNET senior technology reporter Abrar Al-Heeti highlights that the iPhone Air she reviewed regularly ends the day with about 20% to spare (after starting with a full battery). She said it would drop below 20% on heavier-use days by the time she was ready for bed.

“Impressively, the iPhone Air has consistently lasted all day over the last several weeks I’ve been using it,” Al-Heeti said. “But I’ve hardly had to touch that MagSafe battery pack to extend battery life during the day, which is reassuring.”

In our testing, a fully-charged MagSafe battery added 69% to the iPhone Air’s battery. When I asked her whether she’d recommend people buy the $99 MagSafe Battery for the Air, Al-Heeti said that she recommends it for someone who uses their phone often and doesn’t want to hunt for an outlet.

“I don’t like the idea of having to lug around an extra battery, no matter how thin or sleek it is, so I don’t tend to carry it with me unless I know I’m going to have a long day away from home,” Al-Heeti said.

She also reviewed the standard iPhone 17 and said it can easily last a little over a day, even after snapping photos, scrolling through social media, listening to audiobooks and music, texting and watching videos.

Al-Heeti’s review notes that over several days, she’d start with a full battery, between 8:30 and 9:30 a.m., and have 44% to 47% of a charge 12 hours later. If she didn’t recharge the iPhone 17 overnight, she’d still have about 30% to spare the next morning.

The iPhone 17 series charges fast

There are two ways to charge an iPhone: with a cable or with MagSafe (unless it’s the iPhone 16E, which doesn’t have MagSafe, just Qi charging). For wired charging, Apple recommends using a 40W charger with the iPhone 17, 17 Pro and 17 Pro Max and a 20W charger for the iPhone Air. However, Apple doesn’t include a charger in the box, just a USB-C cable, but the company does sell a 40W charger for $39 and a 20W charger for $19.

In our 30-minute wired charging test, the new phones, including the Air, did well. The iPhone 17, 17 Pro and 17 Pro Max added 10% or more than the iPhone 16, 16 Pro and 16 Pro Max in the same test. Apple says the 17 Pro and 17 Pro Max can recharge to 50% in 20 minutes. In our tests, the iPhone 17 Pro hit 53% and the iPhone 17 Pro Max hit 49% after 20 minutes.

The iPhone Air reached 49% in our 30-minute charging test with a 20W adapter, the same as the iPhone 16 and iPhone 15 Pro, beating the iPhone 15 Plus.

In wireless charging or MagSafe charging, we ran a 30-minute test with the latest MagSafe charger and a 30W power adapter. The iPhone 17 series and Air beat every iPhone we’ve ever tested except the iPhone 16 Pro, which did better than the Air and standard iPhone 17. I should note that iPhones don’t come with a MagSafe charger or 30W adapter in the box.

Which iPhone should you buy based on CNET Labs data?

Get the iPhone 17 Pro Max if you want the best battery life. The standard iPhone 17 has great battery life and inches out the more expensive iPhone 17 Pro. And if you’re on Team Air, know that the battery life isn’t great, but depending on how hard you use it, you should get through a day on a single charge.

I should also note that iOS 26 has a new Adaptive Power mode. This feature learns your phone’s use patterns and “adapts” how much power the processor uses for specific tasks, so it draws less from the battery. The new feature takes a week to start working. I turned it on after running CNET’s battery tests and will update this story with any changes or improvements that come from it.

Last, if you have an iPhone and the only issue is that its battery doesn’t charge as much as it used to, think about replacing it with a new one. Doing so will not only be hundreds of dollars cheaper than a new iPhone, but it can extend your phone’s life another couple of years.

Technologies

Ford fends off Hyundai to retain No. 3 U.S. sales position in third quarter

Ford on Friday reported a year-over-year sales decline of 6.6% during the third quarter to 507,395 light-duty vehicles.

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Technologies

A Brexit reversal is on the table 10 years on from the vote that changed Britain. Here’s what’s at stake

Britain voted to leave the European Union in 2016.

U.K. Prime Minister Andy Burnham suggested this week that British voters could be given the chance to reverse Brexit, the country’s highly contentious departure from the European Union a decade ago.

Burnham, who became prime minister over the summer, told the BBC on Wednesday it was “possible” a referendum on rejoining the EU could be included in a future election manifesto.

A U.K. general election is not currently expected before 2029. Prime ministers are able to trigger an early snap election with the backing of parliament, but Burnham — who replaced predecessor Keir Starmer without a public vote — has ruled out such a move.

In his interview with the BBC, the prime minister said a referendum “wouldn’t be the right thing to do right now,” but added that the U.K. must “consider the options” for its relationship with the EU, arguing that “where we are isn’t good enough.”

Asked whether an in-out referendum in a future election manifesto was a possibility, Burnham said: “yes, things are possible.”

During the previous general election — which saw Starmer lead the governing Labour party to a landslide victory and end 14 years of Conservative rule — Burnham was serving as Mayor of Manchester. As he prepared to challenge Starmer’s leadership, Burnham pledged not to “re-run” arguments over Brexit.

In a separate interview with the BBC’s Today program, Burnham said he wanted to “look at the options” for resetting U.K.-EU relations.

“We could stay as we are. That’s definitely an option, if people think this is the right place to stay,” he said, when asked if he wanted Britain to rejoin the union. “We could look at what [former finance minister] George Osborne has said about a customs union, we could look at… the single market or we could go all the way.”

The interviews came after Burnham’s speech at the governing Labour party’s annual conference on Tuesday, in which he said “Brexit hasn’t given us control.”

The 2016 Brexit campaign promised to “take back control” of immigration, free up more money for the country’s health service, and forge trade deals with the rest of the world.

While the value of U.K. goods and services exports has grown significantly in the last decade, according to government figures, immigration and NHS funding pressures are more contentious than ever.

“Later this year, there will be a U.K.-EU summit,” Burnham said at the conference on Tuesday.

“We will not give Britain the clear path we need into the rest of the century until we decide on a long-term relationship with what is still our largest market. I cannot say to you truthfully that where we are is good enough. Brexit has done more harm than good [and] we need to restore a higher level of growth and prosperity for Britain.”

A decade of Brexit

On June 23, 2016, Britons headed to the polls to vote on whether to stay in the European Union. A shock result emerged that night: the electorate had voted to leave the bloc by 52% to 48%.

As the result sank in, the British pound tanked, and London’s FTSE 100 tumbled. Then-Prime Minister David Cameron — who had called the referendum and led the campaign for the Remain vote — resigned.

Britain did not officially leave the EU until 2020. In the interim years, the country’s looming exit from the bloc remained a contentious issue, with so-called “Remainers” staging huge protests against the decision and some political parties putting a reversal of the vote at the heart of their election campaigns.

The U.K. economy has largely failed to experience a post-Brexit boost after upending ties with its largest trading partner, and sterling never returned to its pre-referendum level. The country has also seen a quick succession of prime ministers, with some of the past decade’s seven leaders ousted over the way they handled Brexit and the post-referendum economy.

James Smith, developed markets economist at ING, told CNBC that while Burnham’s statement is politically significant, unlocking tangible economic upside relies on concrete changes to the trading relationship, which could take years.

“Though the PM has opened the door to full EU membership, the reality is that he faces the same constraints that have hemmed in previous leaders,” he said in an email. “The public may agree that Brexit hasn’t gone well, but it’s not clear there is a majority in favor of rejoining. It’s also not at all clear how willing the EU will be to give ground in negotiations, given the recent volatility of U.K. politics and the possibility of a Reform-led government in the future.”

Smith noted that it had taken more than five years to go from referendum to new economic relationship with the EU.

“I suspect it will take much longer for Britain to settle on and implement a new form of relationship now that [Brexit] has dropped down the list of political priorities among voters,” he said.

Steve Nolan, a senior lecturer in economics at Britain’s Liverpool John Moores University, told CNBC on Thursday that some estimates suggest U.K. gross domestic product was 5% to 8% smaller than it would have been without the vote to leave the EU.

“This hasn’t been a surprise to economists — standard models in trade say that if you put up barriers to trade with your nearest trading partner then this will cause problems,” he said. “So there are definite benefits to be reaped by rejoining, but the road towards that outcome could be rocky.”

Any new referendum would increase uncertainty and turmoil, he added.

“The U.K. would also be asking to be let back into the club from a weakened bargaining position and may have to accept many conditions — [such as] euro membership and free movement of labor — that may cause economic and political difficulties. So, there are opportunities to grabbed, but they won’t come without a cost.”

However, Nigel Green, CEO of London-based financial consultancy DeVere Group, said that while closer ties with Europe would make Britain richer, it would also make it easier for capital to leave the country.

“Sterling stands to gain from a steadier relationship with the U.K.’s biggest trading partner, and U.K.-focused equities, priced at a discount for a decade, could start to close the gap,” he said.

But he cautioned that “an open door works both ways,” with entrepreneurs, and senior professionals increasingly telling deVere they were considering leaving the U.K. to avoid the high tax burden.

“The EU reset needs a domestic twin: competitive taxes, faster planning and policy stability that lets businesses look beyond the next Budget,” he said. “Get both right and the U.K. becomes a magnet for capital in Europe. Get only one right and Britain becomes a more convenient place to leave.”

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Technologies

South Korean President Lee Threatens ‘Additional Measures’ to Ukraine Over POW Disclosure

South Korean President Lee Jae Myung has threatened further actions against Ukraine following its disclosure of North Korean POW transfers to Seoul, demanding an apology over the alleged breach of a confidentiality agreement.

South Korean President Lee Jae Myung on Friday criticized Ukraine after its announcement that North Korean prisoners of war were handed over to Seoul, insisting on a public apology and warning of “further actions” against Kyiv.

In a post on X, Lee stated that Kyiv disclosed the transfer of certain captured North Korean soldiers unilaterally, despite requesting confidentiality and later asserting no secrecy pact existed, which made the Korean leader appear as a “liar.”

“As this is a matter concerning the honor of the Republic of Korea’s people and nation, we cannot overlook it,” he said in Korean, translated by Google.

Ukrainian Foreign Minister Andrii Sybiha reportedly characterized the dispute on Thursday as a “diplomatic misunderstanding,” which his nation expects to resolve. Seoul remains a significant partner for Kyiv, Sybiha added.

Alleged Secrecy Pact

During the United Nations General Assembly last week, Ukrainian President Volodymyr Zelenskyy stated that Kyiv had delivered two captured North Korean soldiers to South Korea.

This prompted South Korea to accuse Ukraine of violating a nondisclosure agreement regarding the transfer and to summon Ukraine’s chargé d’affaires for clarification. Seoul also noted that Ukraine requested the transfer remain confidential, as it could adversely affect prisoner exchanges with Russia.

“When we demanded acknowledgement of the agreement and an apology, they instead spoke of an imminent military clash between North and South, praying for the outbreak of war on the Korean Peninsula—we express grave regret toward Ukraine,” Lee said on Friday.

The remarks follow an interview with Ukrainian presidential chief of staff Kyrylo Budanov last week, in which he claimed North Korea’s involvement in the Ukraine-Russia conflict was intended to prepare for combat on the Korean Peninsula.

“The situation is escalating every day. And it is only a matter of time before a trigger event occurs that will lead to uncontrolled consequences,” he added, according to a Google translation of his Telegram post in Ukrainian.

While Kyiv has offered no explanation for why Zelenskyy made the announcement at the UNGA, South Korea’s National Intelligence Service reportedly informed lawmakers he may have done so to rally support in Seoul for supplying Kyiv with weapons and other aid.

In August, Zelenskyy asked South Korea to back Ukraine by providing air defense systems, something Seoul has not supported even as it has offered humanitarian aid to Ukraine.

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