Imagine a power bank that’s not only bigger and better but also significantly less likely to turn into a pocket-sized firework. That’s the promise of Kuxiu’s S3 MagSafe power bank, the latest iteration in their lineup of semi-solid-state portable chargers. Building on the foundation of its predecessor, the S2, the S3 addresses many of the concerns I raised in my previous review (https://www.theverge.com/reviews/656183/kuxius-semi-solid-state-power-bank-costs-a-little-more-but-lasts-much-longer), while introducing a few new features that make it a compelling upgrade. But here’s where it gets controversial: despite the marketing buzz, these aren’t true solid-state power banks. Instead, Kuxiu uses a solid-liquid mixed electrolyte, which they claim reduces the risk of thermal runaway—a common issue with traditional all-liquid Lithium-ion batteries. Is this enough to justify the higher price tag? Let’s dive in.
The 10,000mAh Kuxiu S3 (https://kuxiu.co/collections/solid-state-power-bank/products/kuxiu-s3-power-bank) boasts a unique semi-solid state chemistry that Kuxiu says doubles the lifespan of the battery, promising up to 1,000 charging cycles before capacity drops to 80 percent. Compare that to most 10,000mAh power banks, which typically last for 300-500 cycles, and you start to see the value—even at its full retail price of $149.98. But here’s the kicker: it’s often discounted to under $70 (https://kuxiu.co/collections/solid-state-power-bank/products/kuxiu-s3-power-bank), making it a potentially cheaper long-term investment.
Safety is no small matter, especially in a market plagued by recalls. In September, Anker recalled 481,000 power banks (https://www.theverge.com/news/781072/anker-power-bank-uscpsc-global-recall-fire-risk-battery-zolo-maggo) due to fire and explosion risks, and just last week, INIU recalled 210,000 units (https://www.theverge.com/news/842385/uscpsc-recall-iniu-power-bank-overheat-rire-risk-amazon) linked to 11 fires causing over $380,000 in damage. With such a troubling track record, Kuxiu’s focus on safety feels more than justified—and this is the part most people miss: their semi-solid-state design isn’t just a marketing gimmick; it’s a genuine attempt to address a critical issue.
Beyond safety, the S3 packs a slew of upgrades. A folding metal kickstand, digital display, and detachable USB-C cable (which neatly tucks into the perimeter) add convenience. Plus, with 30W charging input and Qi2 wireless output up to 25W, it’s future-proof for the latest devices. But there’s a trade-off: the larger battery makes the S3 bulkier and heavier (245.3g / 8.65oz) compared to its predecessor, which might deter those seeking a pocket-friendly option. However, its 18 N52 magnets ensure a secure MagSafe connection, even with the added weight.
In testing, the S3 lived up to its 10,000mAh rating, charging an iPhone 15 Pro from 0 to 100 percent once and then to 92 percent before depleting. Efficiency clocked in at 80.83 percent, which is standard for DC/DC circuits. The integrated USB-C cable is a standout feature, eliminating the hassle of carrying extra cords—a small detail that makes a big difference, especially when you’re on the go. While it won’t fully charge a MacBook Pro, it can extend its runtime by a few hours, which is handy in a pinch.
But here’s the question: Is the S3 worth the premium? At $68.99 (https://kuxiu.co/collections/solid-state-power-bank/products/kuxiu-s3-power-bank), it’s pricier than many competitors, but its longer lifespan and safety features could make it a smarter buy. The smaller S2, priced at $49.99 (https://kuxiu.co/collections/solid-state-power-bank/products/kuxiu-s2-power-bank), remains a solid option for those prioritizing portability. Compared to brands like Anker and EcoFlow, Kuxiu’s semi-solid-state technology offers a compelling blend of safety and value—but is it enough to win over skeptics? Let us know in the comments: Would you pay more for a power bank that’s safer and lasts longer, or do you think the risks are overblown?
