Solid-State Power Bank Review - MacRumors
Skip to Content

Review: Kuxiu S2 Power Bank - Semi-Solid State Tech Promises Longer Life, Better Safety

by

When it comes to the MagSafe power bank marketplace, it's largely a sea of sameness. Not this one. Kuxiu's S2 stands apart with its semi-solid state battery technology that promises enhanced safety and longevity, albeit at a steeper price than conventional alternatives.

kuxiu solid state power bank 0

Design and Features

The Kuxiu S2 is a sleek, compact Qi2 unit with a premium construction that has four key components: a magnetic wireless charging area on top, a power button on the side, a USB-C input/output port (braided USB-C cable included), and LED indicator lights that display battery level. The aluminum alloy frame is paired with matte Corning Gorilla Glass panels, and the pack feels like it can take a whack – though it's not impervious to cosmetic scratches, as a couple of weeks' reviewing attest.

At just 143g (5.04oz) and measuring 106 × 69.5 × 10mm (4.17 × 2.74 × 0.39in), it's impressively portable and lighter than an iPhone 16. That said, when attached to my iPhone 16 Pro, the battery extends slightly beyond the phone's bottom edge, creating a minor asymmetry that likely isn't an issue when paired with the iPhone 16 Pro Max. The cameras remain unobstructed, at least.

s2
The S2 has a handy LED indicator system, with four lights showing battery levels: 4 LEDs (>75%), 3 LEDs (>50%), 2 LEDs (>25%), and 1 LED (>10%). When battery drops below 10%, a single LED flashes. There's also a special LED pattern – four lights flickering like a running light – that indicates Small Current Mode is active (more on that below).

The Solid State Difference

In a departure from traditional lithium-ion alternatives, the S2's headline feature is its semi-solid state battery technology. This design eliminates leakage, explosion, and combustion risks. Kuxiu claims the battery can survive nail penetration tests without catching fire or exploding – and based on the company's own dramatic demonstration videos, it continues to function even after such extreme damage.


Despite some confusion on the labeling (which reads "Li Polymer Battery"), Kuxiu confirmed that the S2 does indeed use semi-solid state technology. The solid electrolyte inside can be made from various materials, including polymers – making both claims technically accurate.

Performance and Functionality

The 5,000mAh capacity power bank supports both 15W wireless charging for the iPhone 12 through iPhone 16 series and wired charging at up to 20W via USB-C. The USB-C input specs show it accepts 5V⎓3A/9V⎓2.2A for charging itself.

kuxiu power bank photos3
The manual recommends a first-use procedure: discharging the power bank completely until it shuts off (0%) before fully charging to 100%, preferably with a PD fast charger for optimal speed.

There are three main charging modes: wireless charging (with MagSafe activation), wired charging for other smartphones, and a dedicated Small Current Charging mode. This special mode is activated by double-clicking the power button, and is designed specifically for low-power devices like earbuds and smartwatches that might not draw enough power to keep the bank from auto-shutting off. I had no problems drawing power to charge AirPods Pro via MagSafe and Apple Watch via the charging port.

AirPods
In my testing with an iPhone 16 Pro, the fully charged S2 brought my completely drained phone to 97% before depleting – slightly less than Kuxiu's claim of "approximately 1.2 full charges." The 16 N52 magnets provide a reassuringly strong connection that maintains its grip even when slipped into a loose pocket or bag. If your iPhone has a non-MagSafe case though, the bank is eventually going to slip off.

One particularly impressive aspect is the thermal management. Some slim power banks can become alarmingly hot during discharge (especially at low charge levels), but the S2 remained noticeably cooler in my experience.

Longevity and Value

Here's where the semi-solid state technology really shines. While the S2's $79.99 price tag is approximately 60% higher than comparable liquid-based power banks from companies like Anker or EcoFlow, the longevity benefits are substantial. Kuxiu claims the S2 will maintain 80% of its original capacity after 1,000 charging cycles, compared to just 300-500 cycles for traditional power banks. That's potentially double or triple the useful lifespan.

The efficiency is equally impressive. A full discharge offers 18-19Wh capacity power output, which is excellent after accounting for conversion losses. Looking long-term, this efficiency combined with extended cycle life makes the premium price more palatable.

Summing Up

KUXIU S2 Black 12
The Kuxiu S2 feels like a genuine step forward in power bank technology. The $79.99 price tag initially stings, but when you consider the potential for double or triple the lifespan of conventional alternatives, along with enhanced safety and premium materials, the value proposition becomes clearer. For those who frequently rely on portable power, the investment should pay dividends over time.

What's missing? A kickstand would be nice. Some users might also miss the iOS widget integration that was available in Kuxiu's previous S1 model. Due to Qi2 certification requirements, the S2 doesn't offer the satisfying iOS integration that Apple's own MagSafe battery pack provided – no special animation on the lock screen or appearance in the battery widget. Don't get me wrong, it works flawlessly. It just doesn't feel as "Apple-like" as some might prefer. But these are minor quibbles against what appears to be a genuinely innovative product. If safety and longevity matter more to you than saving a few dollars upfront, the Kuxiu S2 deserves consideration.

Where to Buy

KUXIU S2 Black 1 357e301f 2351 40b4 b983 e7c279d1ad83
The Kuxiu S2 Qi2 5000mAh MagSafe Solid-State Power Bank is available in black or natural titanium colors for $79.99 from Kuxiu's website and authorized resellers.

Top Rated Comments

19 months ago
"That said, when attached to my iPhone 16 Pro, the battery extends slightly beyond the phone's bottom edge"

The fundamental flaw here is that the product doesn’t properly fit a standard iPhone 16 Pro - and that should be made clear. There was a lack of attention to detail during design. The marketing photos conveniently obscure this issue, and even MacRumors photos appear to be glossing over it in their images vs pointing out the flaw.

If you’re going to review or promote products, clarity and transparency matter. Being upfront builds trust and credibility - glossing over major flaws doesn’t.
Score: 14 Votes (Like | Disagree)
19 months ago

I'm assuming the EA will mandate this is all phones by 2027 for safety reasons.
EA? Like the people who make Madden?

I knew they were getting big but wow, I had no idea that they were policymakers now.
Score: 9 Votes (Like | Disagree)
surfzen21 Avatar
19 months ago
I'm assuming the EU will mandate this is all phones by 2027 for safety reasons.

**Edit** I mistakenly typed EA instead of EU. I am preserving the original here so I can be properly roasted but changing it above so my actual intention is properly represented.

Thank you for coming to my TED Talk.
Score: 9 Votes (Like | Disagree)
19 months ago
It sure would be nice to not have ticking time bombs in all our pockets.
Score: 7 Votes (Like | Disagree)
mazz0 Avatar
19 months ago

EA? Like the people who make Madden?

I knew they were getting big but wow, I had no idea that they were policymakers now.
If they do mandate solid state batteries, I'll be pirating mine. I never give EA money.
Score: 6 Votes (Like | Disagree)
19 months ago
Who is going to use a single battery bank for 1000 cycles? Maybe heavy travelers? By the time you get to 1000 cycles, phone batteries will be very large and the bank will not be powerful enough. It's like an EV with a 1,000,000 mile battery. No one is keeping their car for 1M miles. People upgrade.

In the end, most people pay more for a feature they will never use...
Score: 4 Votes (Like | Disagree)

Popular Stories

iphone 17 pro max battery 1 year

Three Years of 80% Charge Limits on iPhone: The Results

Tuesday October 6, 2026 12:59 pm PDT by
Since 2023, Apple's newer iPhones have had an 80 percent charge limit for those who want to extend battery lifespan. Charging to 80 percent instead of 100 percent is supposed to put less stress on the battery, improving longevity. For the last three years, I've used that setting on my iPhone. I started with the iPhone 15 Pro Max, then did the iPhone 16 Pro Max, and most recently, the iPhone...
MagSafe 3 Cable Midnight Feature

Apple Releases MagSafe 3 Charging Cable Firmware Update

Monday October 5, 2026 5:59 am PDT by
For the first time since February 2023, Apple has released a firmware update for the MagSafe 3 charging cable for the MacBook Pro and MacBook Air. Specifically, Apple last week released firmware version 3.2.0 for the USB-C to MagSafe 3 Cable. The previous firmware version for the cable was 3.1.12. It is unclear what is included in the latest firmware, as Apple does not publish release...
Black Apple Event Logo

Sources: Apple Planning Two Sets of Product Launches in October

Monday October 5, 2026 7:24 pm PDT by
Bloomberg's Mark Gurman recently reported that Apple plans to unveil an all-new home hub, a new HomePod mini, and a new Apple TV 4K on Tuesday, October 13, and MacRumors has since learned about another launch slated for later in the month. Apple is planning to unveil additional new products in the final week of October, according to multiple sources familiar with the matter. While we do...
Latest Stories
Microsoft Launches $2,599 Surface Laptop Ultra to Take on MacBook Pro
Microsoft Launches $2,599 Surface Laptop Ultra to Take on MacBook Pro
2 hours ago
Google's SynthID AI Detector is Now Available to Everyone
Google's SynthID AI Detector is Now Available to Everyone
3 hours ago
ChatGPT Gets GPT-6 and New Intelligent UI With Visual Answers
ChatGPT Gets GPT-6 and New Intelligent UI With Visual Answers
5 hours ago
Get AirPods Pro 3 for $179, Apple Watch for $199, and More Before Prime Day Ends Today
Get AirPods Pro 3 for $179, Apple Watch for $199, and More Before Prime Day Ends Today
5 hours ago
Apple Watch Series 12 and Ultra 4 Score 4/10 for Repairability
Apple Watch Series 12 and Ultra 4 Score 4/10 for Repairability
5 hours ago
Apple Launches Creative Labs Program With The King's Trust
Apple Launches Creative Labs Program With The King's Trust
6 hours ago
Apple Watch Series 12, Ultra 4 Owners Report Skin Irritation
Apple Watch Series 12, Ultra 4 Owners Report Skin Irritation
8 hours ago
Boston's MBTA Testing New Charlie Card With Apple Wallet Support
Boston's MBTA Testing New Charlie Card With Apple Wallet Support
9 hours ago
Manchester's Bee Card Now Fully Supported in Apple Wallet
Manchester's Bee Card Now Fully Supported in Apple Wallet
11 hours ago
You Can Get Up to $149 Off Every New Mac Mini During Prime Day
You Can Get Up to $149 Off Every New Mac Mini During Prime Day
12 hours ago
Best Buy Takes $260 Off All iPhone Air Models During Techtober Sale
Best Buy Takes $260 Off All iPhone Air Models During Techtober Sale
12 hours ago
The Best Anker Prime Day Deals: Score Big on MagSafe Chargers and More
The Best Anker Prime Day Deals: Score Big on MagSafe Chargers and More
12 hours ago
12 New Things to Expect From Apple in October
12 New Things to Expect From Apple in October
12 hours ago
Prime Day Offers Best TV Prices of the Year From Samsung, Sony, and More
Prime Day Offers Best TV Prices of the Year From Samsung, Sony, and More
13 hours ago
First Look at LG's Smart Home Products Made With Apple
First Look at LG's Smart Home Products Made With Apple
14 hours ago
Apple Watch Ultra 3 and Ultra 4 See Record Discounts During Prime Day
Apple Watch Ultra 3 and Ultra 4 See Record Discounts During Prime Day
14 hours ago
Apple Drops Intel Macs From Magic Mouse/Trackpad Compatibility Lists
Apple Drops Intel Macs From Magic Mouse/Trackpad Compatibility Lists
14 hours ago
Apple Reportedly Waiting on Samsung for Ultimate Bezel-Free iPhone Display
Apple Reportedly Waiting on Samsung for Ultimate Bezel-Free iPhone Display
15 hours ago
Apple's Own Home Security Camera Still Coming Next Year
Apple's Own Home Security Camera Still Coming Next Year
16 hours ago
Unfolded iPhone Duo Lets You Preview Documents in a Two-Page Layout
Unfolded iPhone Duo Lets You Preview Documents in a Two-Page Layout
17 hours ago
Formula 1 Coverage on Apple TV to Get Dolby Atmos Later This Month
Formula 1 Coverage on Apple TV to Get Dolby Atmos Later This Month
18 hours ago
LG Making Doorbell, Lock, and Cameras for Apple's Home Hub
LG Making Doorbell, Lock, and Cameras for Apple's Home Hub
1 day ago
Apple to Report Q4 2026 Earnings on November 2
Apple to Report Q4 2026 Earnings on November 2
1 day ago
Three Years of 80% Charge Limits on iPhone: The Results
Three Years of 80% Charge Limits on iPhone: The Results
1 day ago
macOS 27.2 Further Hints at MacBook With Touch-Enabled OLED Display
macOS 27.2 Further Hints at MacBook With Touch-Enabled OLED Display
1 day ago
The 15 Best Apple Deals Under $200 for Prime Day
The 15 Best Apple Deals Under $200 for Prime Day
1 day ago
AirPods Pro 3 and AirPods Max 2 Get Big Price Drops for Prime Day
AirPods Pro 3 and AirPods Max 2 Get Big Price Drops for Prime Day
1 day ago
Apple Releases Second Public Betas of iOS 27.2 and macOS Golden Gate 27.2
Apple Releases Second Public Betas of iOS 27.2 and macOS Golden Gate 27.2
1 day ago
'Crossy Road Rush' Launching Exclusively on Apple Arcade in November
'Crossy Road Rush' Launching Exclusively on Apple Arcade in November
1 day ago
Apple Watch Series 9 vs. Series 12 Buyer's Guide: Is It Worth Upgrading?
Apple Watch Series 9 vs. Series 12 Buyer's Guide: Is It Worth Upgrading?
1 day ago