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Power Up Everything With the Best Portable Chargers

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Power Up Everything With the Best Portable Chargers


What Features Should I Look for in Power Banks?

There are a few things worth thinking about when you’re shopping for a portable charger.

The capacity of a power bank is measured in milliampere-hours (mAh), but this can be a little misleading because the amount of power you get out depends on the cable you use, the device you’re charging, and the charging method (Qi wireless charging is less efficient). You will never get the maximum capacity. We try to provide a minimum estimate of what you’ll get in terms of charges for devices.

The charging rate for devices like smartphones is measured in watts (W), but most power banks list the voltage (V) and the amperage (A). Thankfully, you can calculate the wattage yourself simply by multiplying the voltage and amperage. Unfortunately, getting that maximum rate also depends on your device, the standards it supports, and the charging cable you use. Many smartphones, including Apple’s iPhones, support the power delivery standard, meaning you can use higher-power power banks to recharge the device with no issues. A few phones, such as Samsung’s Galaxy S range, support a supplementary PD protocol called PPS (Programmable Power Supply) that goes up to 45 watts. Many phones also support Qualcomm’s proprietary Quick Charge (QC) standard. There are also other proprietary fast-charging standards, but you won’t generally find power banks that support them unless they come from the smartphone manufacturer.

Your device will need pass-through support if you want to charge your power bank and use it to charge another device simultaneously. The Nimble, GoalZero, Biolite, Mophie, Zendure, and Sharge portable chargers listed support pass-through charging. Anker discontinued support for pass-through in some of its products because it found that differences between the output of the wall charger and the input of the device being charged can cause the power bank to cycle on and off rapidly and shorten its lifespan. Monoprice does not support pass-through charging either. We would advise caution when using pass-through, as it can also cause portable chargers to heat up.

Can I Take a Power Bank on a Plane?

It’s safe to travel with a power bank, but there are two main restrictions to keep in mind when you board a flight: You must have the portable charger in your carry-on luggage (it cannot be checked), and it must not exceed 100 watt-hours (WH). If your power bank has a larger capacity than 27,000 mAh, you should check with the airline. Below that should not be a problem.

Some airlines introduced stricter rules in 2025, so always check with your chosen airline before you travel. For example, some airlines prefer you not to use or charge power banks during a flight, some require power banks to be in your hand luggage under the seat in front of you and not in the overheads, and some limit the number of power banks you can have onboard.

Why You Should Avoid Cheap Power Banks

Many years ago, the Samsung Galaxy Note 7 gained notoriety when its batteries caught fire in a series of incidents. There’s been a steady stream of similar, though isolated, incidents ever since. However, despite the high-profile coverage of batteries gone wrong, the vast majority of lithium-ion batteries are safe.

The chemical reaction that occurs inside a lithium-ion cell is complex, but as in any battery, there’s a negative and a positive electrode. In lithium batteries, the negative is a lithium-carbon compound, and the positive is cobalt oxide (though many battery makers are moving away from cobalt). These two compounds cause a reaction that is safe when controlled and delivers energy to your devices. When the reaction gets out of control, though, you end up with earbuds melting in your ears. What changes a safe reaction to an uncontrolled reaction can be any number of things: excess heat, physical damage during use, physical damage during manufacture, or using the wrong charger.

The three basic rules that have kept me safe (thus far) through testing dozens and dozens of batteries are:

  1. Avoid cheap cords, chargers, and outlet adapters.
  2. Make sure batteries aren’t exposed to excessive heat (over 110 degrees Fahrenheit).
  3. Regularly inspect batteries for signs of damage.

Avoiding cheap wall-outlet adapters, cords, and chargers is the most important. These are your most likely source of problems. Those chargers you see on Amazon for $20 cheaper than the competition? Not worth it. They probably got the price down by skimping on insulation, leaving out power-management tools, and ignoring the basics of electrical safety. Price alone is no guarantee of safety, either. Buy from reputable companies and brands.

Then there’s heat. Too much of it can cause all manner of problems, both in terms of discharge and in terms of safety. Avoid heat, and pay attention to your batteries when they’re charging. If your device gets overly hot when charging, this can be a sign of problems. Similarly, beware of any swollen, bulging, or otherwise misshapen batteries.

I’ve been testing power banks for close to two decades now, and my home office has stacks of ’em at any given moment. I test every portable charger that comes in for at least two weeks. I always check how many times it can fully charge my test phone (currently an iPhone 16). I’ll also try charging my Pixel 9 and Samsung Galaxy S24+ to test charging speeds, and whatever else I have in. For larger capacity power banks, I test charge an iPad Mini and a MacBook Air. I test how long it takes to recharge each empty power bank.

Aside from standard tests, I try to use the power banks in my everyday life, just to see how they feel, and my wife and kids often help out and share their opinions. For some of our top picks, I continue to test over months to try and get a sense of their reliability and durability, though it’s not possible to do this for every device that lands on my desk. Beyond function, I take form and usability into account. I keep an eye on user reviews and consider the warranties and customer service of each manufacturer.

How Does WIRED Select Power Banks to be Reviewed?

I often scan the latest releases to seek out worthy prospects, whether from an unknown new brand or an established favorite like Anker. I also get pitched many power banks every week. I sometimes reach out to these companies to ask for the product, but never promise any kind of editorial coverage—that goes against WIRED’s editorial policies. While WIRED usually earns affiliate revenue if you purchase a power bank using our link, this is not factored into the decision process when ranking.

There are too many power banks on the market for me to test everything, so I tend to stick to reputable brands, but there’s always room for something new if it has a compelling new feature or price, and I cover as many as I can. (Leave a comment or send me an email if you want me to test a power bank from a certain brand!) Once testing is complete, I typically donate power banks to a local charity. I try to hang on to some of our top picks for comparison purposes and to test their longevity.

Other Portable Chargers We’ve Tested

There are so many portable chargers out there. Here are a few more we like that just missed out on a place above for one reason or another.

Iniu Portable Charger for $21: This power bank is very small for a 10,000-mAh capacity. You can charge at up to 45 watts from either of the USB-C ports or 18 watts from the USB-A, but recharging is limited to 20 watts. The smart design includes a detachable USB-C cable that serves as a carry loop and a small display to show remaining power. Sadly, it fell short of the stated capacity in my tests, and the display sometimes failed to update the remaining percentage correctly.

Voltme HyperCore 20 for $30: Slim, high-capacity (20,000 mAh), and cheap, this Voltme power bank is a decent value. It worked fine in testing but fell well short of the stated capacity, and charging rates proved slow. This portable charger also takes several hours to recharge (six hours with the right charger, over 20 hours with a normal charger). I also tested the HyperCore 10 ($20) and the 10K Pro ($23). The 10K Pro can charge devices at up to 30 watts, making it the pick of the bunch.

Photograph: Simon Hill

OnePlus Slim Magnetic Power Bank for $70: Sleek in silver grey aluminum with a chamfered edge, this power bank looks lovely and is very slim, not to mention lightweight at just 120 grams. But the 5,000-mAh capacity is just over half that after inefficiency takes a bite. Wireless charging tops out at 10 watts for Android and 7.5 watts for iPhone (even wired charging is limited to 10 watts). You can snag better performers for less.

Denvix PowerX Power Bank for $180: This beefy 25,000 mAh power bank can put out up to 200 watts via two USB-C ports, one USB-A, and a Qi wireless charging pad, to charge four devices simultaneously, maybe a laptop, a couple of phones, and some earbuds. The display shows power remaining, watts in or out, temperature, and a few other stats. It’s a solid option if you want something that can charge laptops, but the finish is a little too smooth, and it gets very warm when charging multiple devices.

Sharge Flow Mini a silver rectangular power bank.

Photograph: Simon Hill

Sharge Flow Mini for $13: With a similar design to Anker’s Nano Power Bank above and the same 5,000-mAh capacity, you might be tempted to go for this instead. It comes with interchangeable USB-C to USB-C or Lightning connectors (which I worry will be easy to lose) and has a built-in USB-C cable that doubles as a strap, though it’s tricky to pull out. There’s a power button with four LEDs to show the remaining power, and it only takes an hour and a half to refill, but the charging rate maxes out at 12 watts either way.

Cuktech 10 Power Bank for $32: With impressive build quality, including a nice grippy material on the underside and a handy display showing power output and input, this Cuktech (pronounced chook-tek) power bank almost earned a place above. Despite the modest capacity, it is built for speed and capable of outputting 100 watts, with support for PD 3.0 and PPS. It can also recharge in less than an hour (up to 90 W). The trade-off for the high speed is low efficiency. You won’t get anywhere near the 10,000-mAh capacity advertised, but this is true of most power banks. I also tested the higher-capacity Cuktech 15 Ultra ($110), which boasts double the power, can charge two or three devices simultaneously at up to 165 watts, and supports many fast-charging protocols including PPS, QC, PD3.1, FCP, SCP, and MiPPS.

Baseus Blade 2 for $80: With an extremely thin design, this 12,000-mAh-capacity power bank is easy to slip into a backpack and can charge most phones a couple of times or top up a laptop at up to 65 watts. It has a display showing battery life as a percentage of time remaining and the input or output for both USB-C ports. We’ve tried many products from up and down the Baseus product line. While they are generally reliable, we do think there are better options.

FansDreams MChaos for $46: I love the idea of a wearable power bank, and this one comes in lime green with a carabiner that makes it easy to attach to a bag. It also has a built-in, retractable, 28-inch USB-C cable to charge your phone at up to 20 watts. Recharging the power bank is a little slower at 18 watts. The colored LED gives you a sense of remaining juice as it goes from green to orange to red, but the 5,000-mAh capacity means you’ll be lucky to get one full charge for your phone, and even the discounted price feels a little high. I also tested the 10,000-mAh model ($50), which has a nicer design. Pull the 2.3-foot retractable USB-C cable out and the percentage remaining pops up visible through the shiny plastic of the case. There’s a USB-C port on the bottom for charging, and it goes up to 22.5 watts either way.

Iniu Power Bank BaI-B64 for $80: Offering relatively low prices, Iniu is a power bank brand on the rise. This portable charger packs a 27,000-mAh capacity, can put out up to 140 watts, and charges three devices at once via two USB-C ports and a single USB-A port. We also tested the very similar BI-B63 ($60), which has a slightly lower capacity at 25,000 mAh but seems like a better value. Unfortunately, both fell slightly short of the stated capacity when tested. We also like the color options available in the company’s slimmest version.

Anker Prime Power Bank

Photograph: Anker

Anker Prime Power Bank for $130: With a total combined output of 200 watts and a hefty 20,000-mAh capacity, this is a solid choice for charging any device; you could even use it to charge two laptops at once via the two USB-C ports. There is a USB-A port, too, and a digital screen. You can also buy a Power Base ($185) for this, which enables you to stick the power bank on top and charge it via Pogo Pins. The base makes it easy to keep the power bank topped up and is handy for desktop charging with two USB-C ports and one USB-A port (combined max output 100 W). I tried the UK version (£88), which worked great, but WIRED reviews editor Julian Chokkattu had issues with the US base failing to charge the power bank.

Anker Nano Power Bank 10,000 for $30: Another solid option from Anker (also available for £40 from Amazon UK), this power bank has a built-in USB-C cable that doubles as a loop for easy carrying and a further one USB-C and one USB-A port. It has a 10,000-mAh capacity, good for just shy of two full charges for most phones. It maxes out at 30 watts each way and can be fully charged in around two hours.

Mophie Powerstation, Powerstation XL, and Powerstation Pro AC for $36+: Mophie’s 2023 update to its Powerstation line has three devices in 10,000-, 20,000-, and 27,000-mAh capacities. They’re bulky, nondescript devices with USB-C and USB-A ports, but the latter has an AC port and is great for travel. WIRED reviews editor Julian Chokkattu used the XL during his trip to Japan and had no trouble keeping his Switch Lite and Pixel 7 Pro topped up. There are LEDs to indicate remaining battery life, but there’s otherwise nothing special about ’em.

iWalk Portable Charger for $27: WIRED reviews editor Julian Chokkattu used the Lightning version of this power bank while covering the Apple event, and it reliably topped up his iPhone. The 4,800-mAh capacity won’t fully refill your device, but it’s tiny enough to keep in a bag at all times. There’s an LED that shows the remaining percentage of power left.


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Here’s Every Country Directly Impacted by the War on Iran

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Here’s Every Country Directly Impacted by the War on Iran


On February 28, United States and Israeli forces launched a series of strikes on Iran, kicking off turmoil in the Middle East.

Pete Hegseth, the secretary of the Department of Defense, said in a recent press conference that the operation could last as long as eight weeks. President Donald Trump himself said in a press conference on March 2 that the administration projected the operation would last four or five weeks but had “the capability to go far longer than that.”

This week Iran has responded in turn, attacking Israel, regional US embassies and military bases, and other sites across the Middle East. Iran has peppered neighboring countries with hundreds of drone and ballistic missile strikes since the operation began. While many of these have been intercepted, over a thousand people have died in the region and multiple buildings have been damaged, including luxury hotels in Dubai, US military bases and embassies, and international airports and marine ports.

Israel has also started bombarding Lebanon, following strikes at the country by the Lebanese militant group Hezbollah.

The Trump administration has given various, and at times seemingly contradictory, justifications for the military action, citing everything from potential “nuclear threat” to unverified claims that Iran attempted to interfere in the 2020 and 2024 US presidential elections. As of March 5, Congress, which in the US has the sole power to declare war, has not done so.

The attacks have already disrupted supply chains, creating uncertainty for the oil and gas and fertilizer industries as key infrastructure has been targeted or shut down out of caution. Shipping traffic has halted along the Strait of Hormuz, a critical route.

As the conflict continues to escalate and expand, WIRED is tracking which countries have been affected and how. This article was last updated on March 5.

Iran

As of March 4, Iranian state media estimates that over 1,000 people have died in the country since the US-Israeli attacks began. Several schools and hospitals have been hit, according to Al Jazeera. The Israeli Air Force says it has struck Iran with over 5,000 munitions since the beginning of the operation.

Israel

Israel has faced retaliatory strikes from Iran. As of March 4, at least 11 people have died and over 40 buildings have been damaged in Tel Aviv, according to Al Jazeera.

Azerbaijan

On March 5, Azerbaijan said drone attacks launched from Iran had crossed over the country’s borders and damaged an airport building and two civilians. President Ilham Aliyev of Azerbaijan said that the country’s military forces “have been instructed to prepare and implement appropriate retaliatory measures,” according to Reuters. Iran has denied responsibility for the attacks, according to Al Jazeera.

Bahrain

Missile and drone strikes have targeted different locations in Bahrain, including a US naval base, according to the BBC. On March 2, Amazon reported that a drone strike occurred in close proximity to one of its data centers in the country. CNBC later reported that Iranian state media said that Iran had targeted the data center because of the company’s support of the US military.

Cyprus

On March 2, a drone strike hit a British air base in Cyprus, according to Reuters. It caused limited damage and no casualties. Greece, the UK, and France have lent defensive support to the country, according to a Bloomberg report.

Iraq

Since February 28, there have been reports of multiple Iranian strikes aimed at a US military base near the Erbil International Airport, according to the nonprofit monitoring group Armed Conflict Location and Event Data.

Jordan

Jordan’s armed forces have intercepted dozens of missiles since the start of the conflict. At least one Iranian-backed militant group in Iraq has claimed responsibility, according to the Associated Press. On March 2, the US Embassy in the country announced that all its personnel had temporarily departed.

Kuwait

Kuwait has endured multiple waves of Iranian missile and drone attacks since February 28. On March 2, US Central Command said in a statement that three US fighter jets were accidentally struck down by Kuwaiti air defenses during an attack that included Iranian aircraft, missiles, and drones.

Lebanon

Israel attacked southern Lebanon after the militant Lebanese group Hezbollah launched rocket and drone attacks against them. Lebanon prime minister Nawaf Salam subsequently banned Hezbollah’s military and security activities, according to Al Jazeera.

Oman

Oman’s Duqm commercial port has been hit by several drone attacks, according to Al Jazeera. Omani authorities have said at least one oil tanker off the country’s port of Khasab in the Strait of Hormuz has been attacked.

Qatar

On March 2, QatarEnergy posted on X saying that it would halt production of liquified natural gas following a military attack on its operational facilities in the country. It did not attribute the attack to any particular country. On March 3, it posted again, saying that it would also stop the production of additional products, including urea, polymers, methanol, and aluminum.

Saudi Arabia

Infrastructure in Saudi Arabia has been targeted with projectiles. On March 3, the US embassy in Riyadh, the country’s capital, was damaged following an attack. On March 4, Reuters reported that one of the Saudi Aramco’s largest domestic refineries of Saudi Aramco, the majority state-owned oil company, was targeted by an attempted drone attack.

Syria

Tom Fletcher, the United Nations undersecretary-general for humanitarian affairs and emergency relief, says that civilians and civilian infrastructure were under attack in several countries including Syria.

Turkey

On March 4, the Turkish Ministry of National Defence announced that NATO had intercepted ballistic munitions launched from Iran, and that munition fragments had fallen into Hatay, a province that borders the Mediterranean Sea and Syria. Iran has denied any missile launch towards the country.

United Arab Emirates

As of March 4, UAE Ministry of Defence officials say that the country has intercepted hundreds of drone and missile attacks from Iran. Despite the relatively high rate of interceptions, debris created by the fallout has still damaged areas of the country. In Dubai, the luxury hotel Burj Al Arab was struck by debris, as well as the Palm Jumeirah, a man-made island home to high-end hotels and apartments. On March 2, Amazon Web Services announced that two of its facilities were directly struck in the country, causing “elevated error rates and degraded availability.”

Countries Evacuating Citizens

On March 2, US assistant secretary of state for consular affairs Mora Namdar posted on X urging Americans to depart from several middle eastern countries due to “serious safety risks.” On March 4, Reuters reported that the US military has offered seats on military transport planes to Americans trying to leave the region.

Over a dozen countries have announced that they will be evacuating their citizens from the area or sponsoring repatriation flights, including the UK, Ireland, Germany and Italy.



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OpenAI Had Banned Military Use. The Pentagon Tested Its Models Through Microsoft Anyway

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OpenAI Had Banned Military Use. The Pentagon Tested Its Models Through Microsoft Anyway


OpenAI CEO Sam Altman is still in the hot seat this week after his company signed a deal with the US military. OpenAI employees have criticized the move, which came after Anthropic’s roughly $200 million contract with the Pentagon imploded, and asked Altman to release more information about the agreement. Altman admitted it looked “sloppy” in a social media post.

While this incident has become a major news story, it may just be the latest and most public example of OpenAI creating vague policies around how the US military can access its AI.

In 2023, OpenAI’s usage policy explicitly banned the military from accessing its AI models. But some OpenAI employees discovered the Pentagon had already started experimenting with Azure OpenAI, a version of OpenAI’s models offered by Microsoft, two sources familiar with the matter said. At the time, Microsoft had been contracting with the Department of Defense for decades. It was also OpenAI’s largest investor, and had broad license to commercialize the startup’s technology.

That same year, OpenAI employees saw Pentagon officials walking through the company’s San Francisco offices, the sources said. They spoke on the condition of anonymity as they aren’t licensed to comment on private company matters.

Some OpenAI employees were wary about associating with the Pentagon, while others were simply confused about what OpenAI’s usage policies meant. Did the policy apply to Microsoft? While sources tell WIRED it was not clear to most employees at the time, spokespeople from OpenAI and Microsoft say Azure OpenAI products are not, and were not, subject to OpenAI’s policies.

“Microsoft has a product called the Azure OpenAI Service that became available to the US Government in 2023 and is subject to Microsoft terms of service,” said spokesperson Frank Shaw in a statement to WIRED. Microsoft declined to comment specifically on when it made Azure OpenAI available to the Pentagon, but notes the service was not approved for “top secret” government workloads until 2025.

“AI is already playing a significant role in national security and we believe it’s important to have a seat at the table to help ensure it’s deployed safely and responsibly,” OpenAI spokesperson Liz Bourgeois said in a statement. “We’ve been transparent with our employees as we’ve approached this work, providing regular updates and dedicated channels where teams can ask questions and engage directly with our national security team.”

The Department of Defense did not respond to WIRED’s request for comment.

By January 2024, OpenAI updated its policies to remove the blanket ban on military use. Several OpenAI employees found out about the policy update through an article in The Intercept, sources say. Company leaders later addressed the change at an all-hands meeting, explaining how the company would tread carefully in this area moving forward.

In December 2024, OpenAI announced a partnership with Anduril to develop and deploy AI systems for “national security missions.” Ahead of the announcement, OpenAI told employees that the partnership was narrow in scope and would only deal with unclassified workloads, the same sources said. This stood in contrast to a deal Anthropic had signed with Palantir, which would see Anthropic’s AI used for classified military work.

Palantir approached OpenAI in the fall of 2024 to discuss participating in their “FedStart” program, an OpenAI spokesperson confirmed to WIRED. The company ultimately turned it down, and told employees it would’ve been too high-risk, two sources familiar with the matter tell WIRED. However, OpenAI now works with Palantir in other ways.

Around the time the Anduril deal was announced, a few dozen OpenAI employees joined a public Slack channel to discuss their concerns about the company’s military partnerships, sources say and a spokesperson confirmed. Some believed the company’s models were too unreliable to handle a user’s credit card information, let alone assist Americans on the battlefield.



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Don’t Risk Birdwatching FOMO—Put Out Your Hummingbird Feeders Now

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Don’t Risk Birdwatching FOMO—Put Out Your Hummingbird Feeders Now


Though most people associate the beginning of March with the hopefulness of spring and the indignities of daylight saving time, there’s another important event taking place yards all over the country: hummingbird season.

While many species of hummingbirds can be seen in regions year-round, others are migratory, and this time typically marks their return from wintering grounds in Central and South America. These tiny birds can lose up to 40 percent of their body weight by the time they arrive here after having flown thousands of miles, and since many flowers haven’t bloomed yet, nectar feeders can be a source of essential fuel.

Though I test smart bird feeders year-round, I don’t use hummingbird feeders as often as I should, as it’s imperative that they be cleaned and refilled with new nectar every two or three days (a ratio of 1:4 granulated sugar to water is best, and avoid any dyes or additives) to prevent deadly bacteria and mold, and I don’t always have the time.

But if you are going to invest the energy in maintaining a hummingbird feeder, right now is the best time, as you have a chance to see migratory species you might not otherwise encounter, such as black-chinned hummingbirds. A smart feeder helps you ID them, whether they’re stopping at your feeder on their way north or arriving at their final destination.

Birdbuddy’s Pro is the smart hummingbird feeder I recommend and use myself when I’m not actively testing. The app is easy to navigate and sends cleaning reminders, the built-in solar roof keeps the battery charged, and, unlike other feeders, only the shallow bottom screws off for refilling. No having to pour sticky nectar through a narrow opening, or turn a giant cylinder upside down and risk spilling.

Note that it’s not perfect; the sensor is inconsistent and doesn’t capture every hummingbird that visits, but for the camera quality (5 MP photos, 2K video with slow-motion, 122-degree field of view) and ease of use, it’s a foible I’m willing to put up with. If you already have another Birdbuddy feeder, the hummingbird feeder images and videos will integrate seamlessly into your app feed.

Birdbuddy

Pro Smart Solar Hummingbird Feeder

Right now, the feeder is 37 percent off on Birdbuddy’s website—a deal I usually don’t see outside of shopping events like Black Friday or Amazon Prime Day. Note that the feeder only runs on 2.4 GHz Wi-Fi, and while it is fully functional without a subscription, a Birdbuddy Premium subscription will let you add friends and family members to your account so they can see the birds as well. That’s $99 a year through the app.


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