CIO Co., Ltd. released the white version of its SMARTCOBY Ex04 Wireless2.2 CABLE SS5K, a 5,000mAh power bank that combines Qi2.2 wireless charging with a detachable, built-in USB-C cable, on June 19, 2026[1]. It is priced at 7,130 yen (tax included) and is available through Amazon.co.jp, the official CIO store on Rakuten, select electronics retailers, and CIO's own CIO STORE outlets[1][2]. A key selling point is its semi-solid battery cells, which use less of the electrolyte that can trigger fires, balancing safety with portability.
Fire-Resistant Semi-Solid Cells and Temperature Control
The standout feature is the use of semi-solid battery cells that reduce the electrolyte responsible for ignition[1]. CIO positions this as the core of a safety-conscious design. That said, the term "semi-solid" here is CIO's own operational label rather than an industry-standard specification, which is worth keeping in mind[1].
Beyond the cells themselves, the unit pairs a heat-dissipating "NovaCore C2" design with "NovaSafety S2," an output-control feature based on heat detection[1]. The system constantly monitors the unit's temperature and automatically throttles power under heavy loads to keep heat in check[1]. Because power banks are carried around and often used inside bags or pockets, a design that adjusts output while watching temperature adds to everyday peace of mind.
Up to 25W Qi2.2 Wireless Charging with MagSafe Attachment
Wireless charging supports the Qi2.2 standard, delivering up to 25W[1]. With a MagSafe-compatible smartphone, you can snap the unit onto the back of the phone and charge without a cable[1].
Qi2 is a standard defined by the Wireless Power Consortium (WPC), the industry body for wireless charging, and is characterized by magnet-based alignment derived from Apple's MagSafe[3]. In 2025 the available power was raised from the earlier 15W to 25W, and the SMARTCOBY Ex04 follows this latest 25W tier[3]. According to CIO, charging an iPhone 17 Pro wirelessly for 30 minutes is designed to reach 35 percent[1].
Detachable Built-in USB-C Cable for Up to 20W Wired Charging
The power bank also supports wired charging, delivering up to 20W through its built-in USB-C cable of about 21cm[1]. Wired charging tends to lose less energy than wireless, so it offers a more stable, faster charge when you are in a hurry[1]. CIO estimates that 30 minutes of wired charging reaches 48 percent on an iPhone 17 Pro and 37 percent on a Google Pixel 10 Pro[1].
The built-in cable is detachable and can be replaced if it ever breaks[1]. Since you do not need to carry a separate cable, you are less likely to be caught out by forgetting one. The unit keeps a clean look most of the time and lets you pull out the cable only when needed, a design that balances portability and practicality. It also supports full pass-through charging, so the unit can charge while charging a device[1].
5,000mAh in a Roughly 14mm Slim Body
The capacity is 5,000mAh, with body dimensions of about 100 x 70 x 14mm and a weight of around 151g[1]. The roughly 14mm thinness is meant for attaching to a smartphone and carrying the two together, and the footprint is sized to sit comfortably within the width of an iPhone[1]. The shape is designed to remain easy to grip even when you hold the phone with the unit attached[1]. In addition to white, a black version is offered, and the black model went on sale earlier, on March 27, 2026[1].
Price and Availability
The manufacturer's suggested retail price is 7,130 yen (tax included)[1]. Sales run through Amazon.co.jp, the official CIO store on Rakuten, select electronics retailers, and the CIO STORE outlets[1]. To mark the launch, Amazon offers a 10 percent discount via the promotion code "652Q2IYX," and Rakuten provides a coupon for the same discount, both valid from 21:00 on June 18 to 23:59 on June 26[1].
Amazon.co.jp でチェック
CIO モバイルバッテリー 半固体電池 小型 軽量 Qi2.2 ワイヤレス充電 ＆ ケーブル内蔵 薄型 5000mAh 25W出力 SMARTCOBY Ex04 Wireless2.2 CABLE SS (ホワイト)
CIO has also prepared guidance for owners of the previous "SMARTCOBY Ex01 SLIM Qi2 & Cable" model, offering a free exchange to the successor Ex04 as well as a repurchase option[1]. If you are considering upgrading from an older model, it is worth checking the details.
Summary
The SMARTCOBY Ex04 Wireless2.2 CABLE SS5K is a 5,000mAh power bank that foregrounds safety through its semi-solid cells and temperature control, while packing 25W Qi2.2 wireless charging and a detachable built-in USB-C cable into a body about 14mm thick. For anyone who wants to switch between wired and wireless charging without carrying a separate cable, it looks like a practical option for everyday use.
Source:https://prtimes.jp/main/html/rd/p/000000671.000043212.html
Source:https://www.amazon.co.jp/dp/B0FTZ4CYQ4
Source:https://wired.jp/article/what-is-qi2-wireless-charging/
