At a look
Skilled’s Score
Execs
- Slimmest-ever 10K energy financial institution
- Semi-solid-state know-how
- 25W wi-fi or 30W wired charging
- Kickstand
- Vivid good show
Our Verdict
The Kuxiu S4 is the slimmest 10K magnetic wi-fi energy financial institution we now have examined but. In order for you thinner, you’ll must sacrifice half the battery capability with a 5K battery pack.
Value When Reviewed
This worth will present the geolocated pricing textual content for product undefined
Finest Pricing In the present day
Value When Reviewed
$89.99
Finest Costs In the present day: Kuxiu S4 Semi-Stable Secure 25W Wi-fi 10K Energy Financial institution
Once we reviewed the Kuxiu S3 25W 10K Stable-State Energy Financial institution we referred to as it the “quick 25W wi-fi battery pack that has all of it”. We have 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. In truth it’s a bit lower than the S3, however in a single side 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 check 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 dimension you can clamp to the again of your MagSafe iPhone with out it being too cumbersome to pocket—and small pockets will higher admire a 5000mAh (5K) energy financial institution. Learn critiques of all of the greatest magnetic energy banks we now have 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 high 25W, utilizing the most recent Qi2.2 wi-fi charging know-how. Solely the iPhone 16 sequence and later can take all 25W, with older iPhones pegged again at 15W (nonetheless a lot quicker than still-available 7.5W battery packs). Observe that the 17e can also 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 quicker if it’s essential to energy up as shortly as potential, however you’ll have to convey 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, but it surely’s unlikely the iPhone will settle for way more than 35W anyway.
When recharging the S4 energy financial institution, the facility enter is 30W—on the high 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 know-how that’s engineered for superior security, longevity and thermal stability in comparison with normal lithium-ion battery packs. You may skip the subsequent bit when you’re not taken with technical particulars…
What are Semi-Stable State batteries?
Semi-Stable is a transition know-how between conventional liquid lithium-ion batteries and all-solid-state batteries (ASSBs). When all solid-state batteries are mainstream, they may doubtless exchange semi, however semi is pretty much as good as we now have right now. As soon as confirmed in electrical automobiles, we anticipate to see ASSB energy banks in by 2028.
Why so lengthy? All-solid-state batteries would require new manufacturing services, whereas semi-solid-state batteries are appropriate with present lithium-ion manufacturing strains, requiring solely minimal (10-20%) new tools. As such, ASSBs will likely 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 exchange 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 hearth. They’re extra proof against excessive warmth and bodily injury. For this reason we anticipate 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 potential 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 gives 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. Which means 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 quicker and a cable makes recharging the facility financial institution itself much less problem), we additionally want them to be as slim as will be.
That’s the foremost compromise between selecting between the S3 and S4, however there are extra variations. Learn our Kuxiu S3 assessment for extra particulars.
Each energy banks characteristic 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 possibly can 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 provides 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, displaying battery well being, working temperature, battery stage (remaining cost), wi-fi charging energy and USB-C enter/output energy plus battery security alerts the place acceptable.
You won’t have to know all that data but it surely’s there, introduced on three digital circles.
Lastly, the Kuxiu S4 is on the market 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 facility banks that move by our labs.
There’s nothing fancy involving microscopes and spectrometers. We merely drain an iPhone’s battery to 0%, join the facility financial institution and see what number of instances it may well 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 facility financial institution is empty.
The most effective rating we now have acquired 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 similar 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 have to dig a bit deeper, however your trouser-pocket lining might thanks for it over the long run.
For extra choices we now have examined and reviewed the greatest 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 now have examined but. In order for you thinner, you’ll must sacrifice half the battery capability with a 5K battery pack. The S4 carried out above common in our recharging assessments. When you can sacrifice the slimness, take into account 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.
