Tech
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:
- Avoid cheap cords, chargers, and outlet adapters.
- Make sure batteries aren’t exposed to excessive heat (over 110 degrees Fahrenheit).
- 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.
-Reviewer-Photo-SOURCE-Simon-Hill.jpg)
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.
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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HOKA’s max-stacked Rocket X Trail combines road race shoe energy with boosted grip from a 3-mm lugged outsole. If you’re looking for a fast shoe to go on the attack, this is it. It’s also fantastic for all round comfort. In testing, I laced up the Rocket X Trail and ran 3 hours (just short of 19 miles) fresh out of the box, across roads, forest gravel trails, some grass and through some serious water. It delivered efficiency and energy whether I was moving at marathon pace or with heavier, tired, ragged footfalls in the latter miles.
The rockered, supercritical midsole uses HOKA’s liveliest foam, similar to those you find in its race-ready road shoes, along with a carbon plate. That combines for a really fun ride that’s smooth, springy and fast and really consistent. It’s also highly cushioned, so you will sacrifice a lot of ground feel for that big stack springy softness. It’s also less stable over very lumpy terrain. But on open, flat, runnable mixed terrain, it’s excellent.
The lightweight uppers have a race-shoe-ready feel and after running through ankle-deep flooded sections, they shed water really quickly. This is a pricey road-to-trail shoe, it’s versatile and there’s plenty of winter road potential, too.
| Specs | |
|---|---|
| Weight | 9.45 oz |
| Heel-to-toe drop | 6 mm |
| Lug depth | 3 mm |
It’s always pleasing to see an array of physical buttons, and you get sizable ones too. You’re not going to miss these wide flat ones even when picking the pace up. The silicone strap has a nice stretch to it and while the button clasp is a bit awkward to get into place, this watch does not budge.
Suunto has jumped on the flashlight trend, with an LED light strip sat on the front of the case. You can adjust brightness levels and there’s SOS and alert modes to emit a very noticeable pulsating light pattern. This is a light I found useful rooting around indoors as well as on nighttime outings.
The biggest change is the introduction of a 1.5-inch, 466 x 466 AMOLED display. This replaces the dull, albeit very visible, memory-in-pixel (MIP) display. Suunto also ditched the solar charging that did require spending a significant amount of time outside to reap its battery benefits.
Adding AMOLED screens to outdoor watches has been contentious. The older MIP displays are just more power-efficient. The Vertical 2 is down by about 10 days from the older Vertical for what Suunto calls daily use.
Still, even if you’re putting its tracking and mapping features to use, you’re not going to be reaching for the charger every few days. After two hours of tracking in optimal GPS mode, the battery only dropped by 2 to 3 percent. The battery drop outside of tracking is also small and the standby performance is excellent as well.
Software Updates
Photograph: Michael Sawh
A more streamlined set of smartwatch features helps reserve battery for when it really matters. Unfortunately, I probably got better battery life because you don’t get phone notifications or responses if it’s paired to an iPhone instead of an Android. There’s also no onboard music player, but you do get a pretty slick set of music playback controls that are accessible during tracking.
Every NHS trust in England needs an electronic patient record (EPR) system in place by March 2026, as part of a government push to digitise the healthcare system.
In many ways, this is long overdue: some trusts have still been using pen-and-paper record-keeping until very recently.
EPRs have the potential to massively improve efficiency in the NHS. If working properly, they allow doctors to keep all of their records in one place, speed up prescribing and diagnostics, and make it easier for patients to access their own health information.
But these roll-outs have not been without problems. Concerns have been raised about how far these benefits can actually be realised. Some NHS trusts have experienced issues with integrating new systems and training staff on how to use them.
In the extreme, there have been reports of EPRs creating new problems for hospitals, with evidence suggesting these systems may have contributed to serious harm and even deaths among patients.
NHS trusts have been put in charge of procuring their own EPRs, meaning there are numerous different technology companies involved. Some providers of these systems are large US firms. This includes Oracle Health, provided by the Larry Ellison-led tech giant, and Epic, a tech firm based in Wisconsin.
Contracts can run into nine figures: Guy’s and St Thomas’, a trust in South London, launched a £450m system from Epic in late 2023. Some parts of the NHS have been using them for more than a decade, but a handful are still set to miss the government’s March deadline.
Data access
Pritesh Mistry is a fellow at the King’s Fund, where he researches the impact of digital transformation in the NHS. He says it has had “both positive and negative impacts”.
“In the last few years, we’ve seen doubling down on the focus around digital records,” says Mistry. These are now in place in more than 90% of all trusts, and every GP practice.
“That means we’ve now got [new] data that’s within the healthcare system, which allows us to do other things, like treat populations, and understand and track patient safety,” he says.
Despite this, he cautions some patients are still struggling to get hold of their own data.
“We’ve got a lot of data that’s in silos,” says Mistry. “It doesn’t flow. That’s the biggest challenge: making the data accessible and usable for patients and healthcare professionals to be able to provide care in a way that is joined up and meets with modern expectations.”
He says complaints with new technology haven’t just come from patients.
“We need to recognise that staff are really frustrated,” says Mistry. “Software often crashes. Computers are really slow, and technology adds to their workload, instead of simplifying things.” He caveats that some parts of the NHS are better than others on this.
Safeguarding patient data
Mistry adds that there are safeguards in place to ensure patient data isn’t ending up where it shouldn’t be – such as through data protection rules and procurement requirements.
However, he warns that “we need to make sure we move with the times in terms of what technology is available”. Mistry is more concerned about medical staff inadvertently putting personal information into a large language model, for instance.
“Digital exclusion remains a barrier as well,” he says, adding that these systems have the potential to widen inequalities in healthcare. Those less able to use new technology might struggle to access their records.
“People tend to assume it’s old people [who are most impacted], but that isn’t necessarily true,” says Mistry, instead highlighting the impact of poverty and deprivation, with some still unable to afford internet access.
He argues the NHS should be working to meet people where they are, and provide more “tailored” technology services.
Patient safety
Nick Woodier is a doctor and investigator at the Health Services Safety Investigations Body (HSSIB), which looks into issues with healthcare in the UK. He sees problems arising from how EPRs are deployed by trusts, especially when medical staff overestimate their capabilities.
He uses the example of prescribing medicines: “There’s an assumption that these electronic prescribing systems will stop you [from] doing something catastrophic.”
But this isn’t always the case. In one investigation, the HSSIB found a child had been prescribed nearly 10 times the recommended dose of an anti-coagulant medication, with doctors having assumed the EPR would flag an issue. The child ended up with a bleed on their brain.
Woodier also worries hospitals are not always picking up on when these systems are at fault.
“We will often see where incidents have happened and the contribution of the electronic system has not been recognised,” he says.
Woodier sees this as coming from a culture which prefers to put the blame for safety failures on individuals.
A 2024 investigation by the BBC found there were more than 126 instances of serious harm registered by NHS trusts across 31 trusts, including three deaths related to EPR problems.
The HSSIB has also encountered problems from patients being unable to access their digital records.
“We’ve seen in general practice, for example, some patients telling us that they’ve gone without care – because in their mind, they thought the only way they could access their GP was to fill in an electronic form,” says Woodier.
A spokesperson for NHS England says EPRs are “already having a significant impact on improving safety and care for patients”, for instance, by helping to identify conditions such as sepsis, and preventing medication errors.
“They have replaced outdated and often less-safe paper-based systems, and we are working closely with NHS trusts to ensure they are implemented safely alongside other systems with appropriate training – and are used to the highest quality and safety standards,” the spokesperson adds.
Interoperability
The EPR roll-out has also been criticised for problems with “interoperability” – the ability of different programs and modes of data collection to converse with each other. The patchwork of different systems used by different trusts means data stored in one system might not be useful for a system used by a different part of the NHS.
Woodier says this often happens in communications between hospitals and GP surgeries. This can involve someone manually inputting information from one system to another, which can create risks when data is not being transferred properly, or is missed completely.
“When you introduce a manual operation, that risk increases,” he warns. “The odds are that at some point, somebody won’t do the right thing, because that’s the reality of being human.”
Alex Lawrence, a fellow at the Health Foundation, describes interoperability as a “significant challenge”, which the NHS and technology companies have been “grappling with for a really long time”.
“Some trusts have found it much harder to access their own EPR data than they anticipated, because of where that data is stored,” she adds, referring to research the organisation carried out in 2024.
“If it’s taking you days to pull the data that you need, then it’s already not going to be useful for a lot of the purposes that you might want it for.”
However, Lawrence adds that there have been some steps made in the right direction, notably with the Data (Use and Access) Act, which was passed last year.
“The government is making information standards mandatory for EPR providers, as well as trusts, with the Secretary of State potentially having more powers to enforce those standards,” she says.
The longer term
Going forward, Lawrence would like to see a system involving “patients being empowered with access to their own data, and as far as appropriate, clinicians being able to see all of the history that they need for their patients”.
In an ideal system, different parts of the healthcare system would be able to “share a patient’s data where necessary and appropriate, in an easy and timely way”.
She says they have the “potential to offer enormous value”, but much of their functionality is going unused. “What our qualitative research suggested was that a lot of these systems are still functioning as digital notebooks,” says Lawrence.
Matthew Taylor is the head of the NHS Confederation and NHS Providers, membership bodies for healthcare organisations.
“NHS leaders say the gap between trusts on digital maturity is still stark – and it’s shaping how quickly organisations can move to modern EPRs,” he says.
This gap – combined with the organisational complexity of the healthcare system – means interoperability has “long been a thorn in the NHS’s side”.
Taylor adds that EPRs are not a “once-and-done” job, and argues they will result in savings in the long term, but that it may take around five years to see the benefits.
“Hospitals are housing a huge amount of paper records, and the cost of storing, retrieving and managing those records can run into millions of pounds each year,” he says.
These systems are part of a larger picture, and one facet of the conversation, around the use of artificial intelligence in the NHS. AI models for areas such as research and diagnostics will require extensive and standardised medical data.
Mistry warns these AI tools operate on the basis of “garbage in, garbage out”.
“There is a risk that we roll out AI tools without the underpinning data quality it needs,” he says, adding that this could exacerbate inequalities or biases from using AI.
As Woodier puts it: “We’ve got organisations who are still using archaic computers, have got infrastructure that’s not working, are still on old web systems, or have EPRs that don’t talk to each other. A few [trusts] don’t have EPRs.
“So, actually, are we trying to run before we’ve even managed to walk?”
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