Kuxiu has released its new S3 portable battery, addressing many points from the previous S2 model, which was marketed as the “world’s first” semi-solid state power bank. The S3 introduces several new features, including a kickstand and an integrated USB-C cable.
Despite marketing claims, these are not truly “solid state power banks.” The 10,000mAh Kuxiu S3 utilizes a solid-liquid mixed electrolyte, similar to the S2. This composition makes it less susceptible to thermal runaway compared to traditional all-liquid Lithium-ion batteries found in most power banks. Kuxiu states that this unique semi-solid state chemistry also doubles the battery’s lifespan, allowing for approximately 1,000 charging cycles before its capacity drops to 80 percent.
The S3 carries a higher initial price tag than other 10,000mAh power banks, which typically offer 300-500 cycles. While listed at $149.98, it is often discounted, sometimes selling for under $70. This lower effective price point, combined with its extended lifespan, suggests it could be a more economical choice over time.
The safety aspect of these batteries should not be overlooked. Recent months have seen numerous recalls of power banks due to fire and explosion risks. For instance, Anker recalled 481,000 power banks in September, and INIU recalled 210,000 units sold on Amazon, which were linked to 11 fires and significant property damage. The year has been marked by several power bank recalls, highlighting the importance of battery safety.
Beyond safety, the Kuxiu S3 includes several practical enhancements. It features double the battery capacity, a folding metal kickstand, a digital display, and a detachable USB-C cable that conveniently stores within the device’s perimeter. It also supports faster 30W charging input and Qi2 output up to 25W for compatible wireless charging devices.
The Kuxiu S3 simultaneously charging an iPhone wirelessly and an older Android phone via the integrated USB-C cable.
It works with MagSafe-compatible charging cases.
The magnets are strong enough to keep this beefy power bank securely connected.
The display shows battery remaining and the charging state.
The integrated, flat USB-C cable can be completely detached if a longer cable is needed.
While these features are appealing, the larger battery makes the S3 quite heavy when used as a MagSafe charger, and it is less portable. Measuring 106.9 x 71 x 22.15mm (4.20 × 2.79 × 0.87 inches) and weighing 245.3g (8.65oz), it adds significant bulk to a device like the 187-gram (6.6-ounce) iPhone 15 Pro. However, the S3’s strong array of 18 N52 magnets ensures a secure and properly aligned connection for charging.
To assess the unit’s 10,000mAh (38.5Wh) rated capacity, the S3’s integrated USB-C cable was connected to a ChargerLAB POWER-Z C240 power meter, which then connected to an iPhone 15 Pro. The iPhone was charged from 0 to 100 percent once, and then again from 0 to 92 percent before the S3 was depleted. This test yielded 31.12Wh of usable output capacity, indicating an 80.83 percent efficiency from the DC/DC circuit, which is a typical performance level.
The flat, integrated USB-C cable, which neatly tucks into the S3’s edge, proves to be highly practical. While many power banks include superfluous features, the convenience of having a readily available cable is a significant advantage. Although the S3 cannot fully charge a larger laptop battery like a MacBook Pro, it can extend its runtime by several hours. The S3’s maximum charging speed is 35W, which is standard for this category of portable batteries.
Qi-compatible devices can be charged wirelessly at up to 25W.
Kuxiu continues to offer the more compact 5,000mAh S2, available for $49.99. The larger S3, currently priced at $68.99, provides double the battery capacity, a percentage display, enhanced wired and wireless charging capabilities, and the added convenience of a kickstand and integrated USB-C cable.
Compared to power banks from brands like Anker, EcoFlow, and numerous others, the S2 and the new S3’s semi-solid-state chemistry is designed to be safer and potentially more cost-effective over its lifespan, making them a compelling option for those in the market for a new power bank.
