Kuxiu S4 25W Semi-Stable Wi-fi 10K Energy Financial institution evaluate: thinnest 10K magnetic energy financial institution

Value When Reviewed

$89.99

Finest Costs At the moment: Kuxiu S4 Semi-Stable Protected 25W Wi-fi 10K Energy Financial institution

Once we reviewed the Kuxiu S3 25W 10K Stable-State Energy Financial institution we known as it the “quick 25W wi-fi battery pack that has all of it”. We had been impressed by its built-in USB-C cable, built-in kickstand, and super-clear digital battery show.

Now, the identical firm has launched the S4 Energy Financial institution. It’s not the S3 plus some extra. Actually it’s a bit lower than the S3, however in a single facet that’s nice information—as a result of the Kuxiu S4 is the slimmest 10K magnetic wi-fi energy financial institution we’ve ever examined. And it’s fairly particular in different methods, too.

Simon Jary

Energy financial institution specs

• Capability: 38.5Wh (10000mAh)
• Enter charger: USB-C (30W)
• Output charger: Wi-fi (25W) & USB-C (30W)
• On take a look at charged iPhone to: 177%
• Weight: 7.55oz (214g)
• Dimensions: 4.1 x 2.7 x 0.53 inches (104 x 69 x 13.7mm)
• Colours: Cosmic Orange, Black

Battery capability: 10000mAh (10K) is the most important battery measurement that you would be able to clamp to the again of your MagSafe iPhone with out it being too cumbersome to pocket—and small pockets will higher respect a 5000mAh (5K) energy financial institution. Learn opinions of all of the finest magnetic energy banks we’ve examined, each 5K and 10K.

Not all 10K or 5K energy banks have precisely the identical capability. To get extra exact it’s essential to take a look at the capability in watt hours (Wh). The S4’s 38.5Wh is a smidge below the S3’s 39.5Wh. The common 10K battery capability in watt hours is 37.9Wh.

Velocity: For energy output the S4 is rated on the prime 25W, utilizing the newest Qi2.2 wi-fi charging expertise. Solely the iPhone 16 collection and later can take all 25W, with older iPhones pegged again at 15W (nonetheless a lot sooner than still-available 7.5W battery packs). Observe that the 17e can be restricted to 15W, and the iPhone Air to 20W.

The S4’s USB-C port is rated at 30W so will cost your iPhone sooner if it’s essential to energy up as shortly as attainable, however you’ll must carry a USB-C cable—not like with the S3 that comes with its personal built-in. The very quickest wired iPhone charging we’ve seen from a magnetic energy financial institution is 45W from The Baseus PicoGo AM52, however it’s unlikely the iPhone will settle for far more than 35W anyway.

When recharging the S4 energy financial institution, the ability enter is 30W—on the prime finish of magnetic wi-fi energy financial institution vary.

Simon Jary

Just like the S3, the S4 is constructed utilizing semi-solid-state (SSS) battery expertise that’s engineered for superior security, longevity and thermal stability in comparison with normal lithium-ion battery packs. You may skip the subsequent bit should you’re not serious about technical particulars…

What are Semi-Stable State batteries?

Semi-Stable is a transition expertise between conventional liquid lithium-ion batteries and all-solid-state batteries (ASSBs). When all solid-state batteries are mainstream, they are going to doubtless substitute semi, however semi is nearly as good as we’ve as we speak. As soon as confirmed in electrical autos, we count on to see ASSB energy banks in by 2028.

Why so lengthy? All-solid-state batteries would require new manufacturing amenities, whereas semi-solid-state batteries are appropriate with present lithium-ion manufacturing strains, requiring solely minimal (10-20%) new tools. As such, ASSBs will probably be costly—possibly 3-4x—than conventional batteries and so are unlikely to be seen in mainstream laptops till manufacturing ramps up and prices go down..

SSS batteries substitute a big portion of flammable liquid electrolyte with a gel or slurry, usually solely 5–10% liquid stays. The discount of flammable liquid considerably lowers the dangers of thermal runaway, leakage, and fireplace. They’re extra immune to excessive warmth and bodily injury. Because of this we count on airways to permit solely solid-state batteries on flights sooner or later. This improved thermal stability additionally means the batteries ought to carry out higher in colder temperatures.

Apart from higher security, solid-state tech permits the battery to have a better power density, to allow them to be made smaller. They need to additionally last more with a higher variety of attainable cost cycles earlier than capability degradation.

Simon Jary

Thinnest design but

Kuxiu calls the aluminum-alloy S4 “the world’s thinnest 10,000mAh semi-solid-state cell”, and it’s not unsuitable.

13.7mm is the thinnest 10K energy financial institution we’ve examined. The earlier champ, the Anker MagGo 10K Slim, is a full millimeter thicker and presents solely 15W energy output. The common depth of a 10K energy financial institution is eighteen.2mm.

Another 10K energy banks are 16mm or 17mm deep, however the common is 20-22mm. The S4 is a 3rd thinner than these chunky beasts. Let’s be trustworthy, it’s not a sliver of an influence financial institution—it nonetheless appears to be like giant in comparison with the thinnest 5K battery packs—however it’s the slimmest 10K.

Even the 5K energy banks we’ve examined common out at 10.7mm depth, though the slimmest of all (the BMX SolidSafe Air 5K) is a mere 6.8mm deep.

Kuxiu S4 vs Kuxiu S3: slim vs cable

The S4 is noticeably slimmer than the S3 however lacks its lengthy built-in USB-C cable. Meaning Kuxiu has been capable of make the S4 over 35% slimmer—14mm vs 22cm.

Whereas we love a built-in cable on a magnetic energy financial institution (wired charging is all the time sooner and a cable makes recharging the ability financial institution itself much less problem), we additionally need them to be as slim as may be.

That’s the most important compromise between selecting between the S3 and S4, however there are extra variations. Learn our Kuxiu S3 evaluate for extra particulars.

Each energy banks function a stand, and the S3’s stand is bigger and extra strong than the S4’s bottom-mounted pull-out however the S4’s performs effectively sufficient.

Simon Jary

Each have a digital show so you may see exactly how a lot energy stays within the energy financial institution—most make do with 4 tiny LEDs, every of which represents 25% battery cost, in comparison with the precise quantity a digital show readout offers you.

The S3’s is obvious to learn however reveals simply the remaining battery cost. The TFT show on the S4—tucked behind the stand—is smarter and extra colourful, exhibiting battery well being, working temperature, battery degree (remaining cost), wi-fi charging energy and USB-C enter/output energy plus battery security alerts the place applicable.

You may not must know all that data however it’s there, offered on three digital circles.

Lastly, the Kuxiu S4 is offered in a surprising Cosmic Orange to match the iPhone 17 Professional and Professional Max in addition to the identical Black because the S3.

Recharging efficiency

At Macworld we produce a battery efficiency report for all the ability banks that move by way of our labs.

There’s nothing fancy involving microscopes and spectrometers. We merely drain an iPhone’s battery to 0%, join the ability financial institution and see what number of occasions it could actually recharge the telephone. If it fills the telephone up with juice to spare, we wait until the telephone has run out once more and repeat till the ability financial institution is empty.

One of the best rating we’ve received from a 10000mAh (10K) energy financial institution is 190% (the 15W EcoFlow RAPID 10K), with a median rating of 166%. The Kuxiu S4 scored an above-average 172%—across the identical ballpark because the S3.

Kuxiu

Value

The Kuxiu S4 10K Magnetic Energy Financial institution is priced at $84.99 or £64. The S3 is cheaper at $68.99/£54, even with its built-in cable.

In order for you the thinnest 10K magnetic energy financial institution, you’ll must dig a bit deeper, however your trouser-pocket lining might thanks for it over the long run.

For extra choices we’ve examined and reviewed the finest magnetic wi-fi energy banks.

Do you have to purchase the Kuxiu S4 25W Wi-fi 10K Energy Financial institution?

First issues first: the Kuxiu S4 is the slimmest 10K magnetic wi-fi energy financial institution we’ve examined but. In order for you thinner, you’ll need to sacrifice half the battery capability with a 5K battery pack. The S4 carried out above common in our recharging checks. In case you can sacrifice the slimness, think about its S3 sibling that boasts an built-in USB-C cable, however we salute the S4 for being the slim semi-solid-state champion… and we love the Cosmic Orange choice.