Charger maker CIO Inc. began selling its new 5,000mAh semi-solid-state power bank "SMARTCOBY SLIMⅡ Wireless2.2 SS5K" with Qi2.2 wireless charging on May 27, 2026[1]. The slim 11.6mm chassis and roughly 153g design pack in up to 25W wireless charging and full pass-through charging, with a suggested retail price of 7,280 yen including tax. The product is built around the premise of being stacked on top of a smartphone for everyday carry.

A Semi-Solid-State Battery Cell Designed to Resist Burning

What first stands out about this product is the safety design at the battery cell level. Typical lithium-ion batteries rely on a liquid electrolyte, which can be a cause of fire. The SMARTCOBY SLIMⅡ Wireless2.2 SS5K uses a semi-solid-state cell that holds liquid electrolyte to 10 percent or less of the total[1]. CIO says the design is intended to maintain stable performance even under drops, impacts, and repeated daily use.

The product also pairs this cell with CIO's own internal thermal design called "NovaCore C2." According to CIO, the swelling coefficient stays at 80 percent or below even after 300 charge cycles, which the company highlights as resistance to long-term degradation[1]. A safety feature called "NovaSafety S2" further monitors temperature and controls output, and the unit also includes an output-switching mode that adapts to how it is being used[1].

Mobile batteries have drawn attention recently over restrictions on carrying them onto airplanes, and safety has become a more visible concern in this category. CIO has been releasing a series of products using semi-solid-state cells throughout 2026, and the SS5K continues that line.

Up to 25W Qi2.2 Wireless Charging with MagSafe Snap-On

Wireless charging follows the new Qi2.2 standard. Qi2.2 was set by the Wireless Power Consortium (WPC) and raises the output cap from Qi2's 15W up to 25W. The SMARTCOBY SLIMⅡ Wireless2.2 SS5K supports the full 25W[1].

The usage flow is simple: a MagSafe-compatible iPhone or similar device snaps onto the magnetic surface and charges without a cable. It works whether the unit is sitting on a desk or stacked on the back of a phone while on the move. According to CIO, 30 minutes of charging at the full Qi2.2 25W brings an iPhone 17 Pro to about 41 percent[1].

There are still relatively few 5,000mAh-class power banks that pair this capacity with 25W wireless output, so it is notable that CIO has put Qi2.2 into a thin, lower-capacity model.

20W Wired Output and an Ultra-Thin 11.6mm, 153g Body

Wired output is also covered, with the USB-C port supporting up to 20W[1]. Wired delivery loses less energy than wireless and tends to charge more steadily and quickly. CIO estimates that 30 minutes of wired charging brings an iPhone 17 Pro to roughly 50 percent[1].

That combination makes it easy to use the magnetic Qi2.2 link for everyday use and switch to wired when speed matters. The 20W rating also applies to the input side: with a fast charger, CIO says the unit reaches a full charge in about 90 minutes[1].

Dimensions are kept to about 11.6mm thick and roughly 153g[1]. The chassis is made of a hard aluminum alloy that doubles as a heatsink and helps with heat dissipation[1]. Stacked on a phone, the form factor stays unobtrusive and slips easily into pockets or smaller bags.

Full Pass-Through Charging, Pricing and Amazon Sale

Full pass-through charging is another part of the daily-use story[1]. The unit can charge a connected device while itself being recharged, and once the SS5K hits a full charge, the circuit automatically switches to a direct path that powers the device while sparing the internal cell from continued cycling[1]. The result is a single-cable setup that handles both ends overnight, well suited to a desk-side workflow.

The product ships in silver and black, with a suggested retail price of 7,280 yen including tax[1]. Sales channels are Amazon.co.jp and the CIO official online store on Rakuten, and the company notes that the Amazon Smile Sale running from May 27 through June 2 offers the unit at 10 percent off[1]. Since sale prices and stock fluctuate by period, checking the latest figure on the Amazon product page at the time of purchase is the safest move.

Summary

The SMARTCOBY SLIMⅡ Wireless2.2 SS5K is a 5,000mAh power bank that combines a semi-solid-state cell and thermal design for safety with Qi2.2 25W wireless and 20W wired output, all in a body of about 11.6mm and 153g. Priced at 7,280 yen tax included and offered in silver and black, it carries the hallmarks of a unit built to ride on the back of a smartphone every day: MagSafe snap-on, full pass-through, and an aluminum heatsink chassis. For users who care more about thinness, safety, and wireless charging speed than raw capacity, it is a strong fit.

出典:https://prtimes.jp/main/html/rd/p/000000646.000043212.html