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Solid-state batteries represent a significant advancement in energy storage technology, boasting enhanced power, compactness, safety, and sustainability compared to traditional Lithium-ion batteries. However, fully solid-state batteries are not yet feasible for mass production in a cost-effective manner. To navigate this challenge, Kuxiu has introduced a semi-solid state solution, marketing it as the “world’s safest” power bank and claiming it to be a groundbreaking innovation.
Kuxiu’s S2 Qi2 5000mAh MagSafe Solid-State Power Bank, priced at $79.99, supports Qi2 wireless charging at 15W. With a capacity of 5,000mAh (19Wh), this power bank can fully charge the latest iPhone 16 models, which have battery capacities ranging from 3,561mAh to 4,685mAh. Although Kuxiu utilizes “solid state” in the product naming, the company has clarified that the S2 is based on a semi-solid state battery, highlighting the importance of this distinction.
Having used the Kuxiu S2 for a few weeks, I can attest to its functionality, though I have not subjected it to extreme stress tests as the company has.
Understanding “Solid State” Terminology
Confusion around the term “solid-state” is prevalent, even within the battery sector itself. Terminology varies with classifications such as all-solid state, semi-solid state, and quasi-solid state. While all-solid state batteries promise a future devoid of liquid elements, achieving this at scale will likely necessitate interim solutions.
Solid-state batteries utilize a solid electrolyte to facilitate the movement of charged particles, but they differ in their liquid content. Typically, a battery with 5 to 10 percent liquid electrolyte by weight is seen as semi-solid state; less than 5 percent qualifies as quasi-solid state, while zero percent is considered all-solid state. The Kuxiu S2 contains a gel-like mixture, which fits into the semi-solid state category.
“Battery Type: Li Polymer.” A Clarification.
Interestingly, the Kuxiu S2 label identifies the battery type as Li Polymer, which has been the standard in power banks for years. LiPo batteries are known for shorter lifespans and lower energy densities, contradicting Kuxiu’s assertions about the S2. The truth is, solid-state batteries can incorporate various materials, including ceramics and polymers, as solid electrolytes. Thus, Kuxiu’s designation as a Li Polymer solid-state battery appears valid, marking it as a pioneering product in the realm of power banks.
For context, standard Lithium-ion batteries in commonly used power banks contain over 25% liquid, increasing risks of leakage and overheating. While the S2 may not capture all the advantages of true solid-state batteries, such as maximized energy density and enhanced safety, it represents a notable step in the right direction. Importantly, Kuxiu employs existing manufacturing processes to produce the S2, allowing for cost-effective mass production.
Kuxiu asserts that the S2 can endure approximately 1,000 charging cycles before its capacity diminishes to 80 percent. An average 5,000mAh power bank, like those from Anker, may begin degrading after only 300-500 cycles, retaining only 60-80 percent of its initial capacity. Although the S2 is priced about 60% higher than analogous liquid-based power banks, its extended lifespan may justify the investment.
Kuxiu claims a higher energy density of 360Wh/kg compared to the 300Wh/kg typically associated with liquid batteries. In terms of size, the S2 is compact at 10.4 x 6.7 x 1.0 cm and weighs just 145g, making it more portable than some competitors. For instance, EcoFlow’s comparable model measures slightly larger and weighs more. While EcoFlow offers additional features such as a kickstand and faster charging capabilities, Anker’s equivalent is smaller and lighter.
Durability and Design
The Kuxiu S2 is equipped with 16 N52 magnets that facilitate seamless attachment to compatible devices like the iPhone 15 Pro. These sturdy magnets ensure a reliable connection during mobility; however, they are not entirely impervious to collisions that could lead to drops. Despite some minor wear after casual handling, the review unit remains in good condition.
From an aesthetic standpoint, the power bank’s design may not appeal to everyone, with specifications printed on the exterior. The unit is functional with or without a MagSafe-compatible case, though using a case may cause the S2 to heat up slightly. The power bank features a USB-C port that enables simultaneous charging of both the S2 and a connected device.
Charging Efficiency
Charging the S2 from a wall adapter takes about 90 minutes when fully depleted, which could be considered slow by some users’ standards. The power bank can also support various devices outside the Qi2 ecosystem, offering charging capabilities for headphones and other electronics up to 20W. Notably, a low-current mode is available for charging smaller devices, allowing the S2 to function effectively with a broader range of products.
While the S2 lacks a kickstand—a feature seen in several rival models—it is available in both black and titanium colors, allowing users to choose an option that complements their devices.
Final Thoughts
Despite some marketing ambiguity regarding its battery type, the Kuxiu S2 Qi2 5000mAh MagSafe “Solid-State” Power Bank impresses with its design and performance. Although it is pricier than conventional options, the benefits of its semi-solid state technology may offer enhanced safety and longevity, making it a worthwhile investment for consumers.
Source
www.theverge.com