CIO Launches SMARTCOBY SLIMⅡ Pro8K Power Bank in Black, About 11mm Thin for 7,130 Yen
Japanese charger maker CIO has started selling a black version of its 8,000mAh power bank "SMARTCOBY SLIMⅡ Pro8K," which supports wired 30W output, on Amazon.co.jp from May 1, 2026[1]. The model combines a body about 11mm thin with an 8,000mAh capacity and a maximum 30W output from a single USB-C port. The manufacturer's suggested retail price is 7,130 yen (tax included). The black colorway joins the existing silver variant.
About 11mm Thin Body with 8,000mAh and 30W Output
A defining feature of the SMARTCOBY SLIMⅡ Pro8K is its slim design. While packing an 8,000mAh battery, the device is only about 11mm thick[1]. The capacity is enough to charge a typical smartphone roughly once or more, while still fitting easily into a jacket pocket or a small bag.
On the output side, the unit supports up to 30W from a single USB-C port[1]. That puts it above the 20W class that struggles with tablets, some lightweight laptops, and portable game consoles, opening the door to fast-charging devices like iPads, MacBook Air units, or the Steam Deck from this single power bank. For users who want to consolidate their charging gear when stepping out the door, it offers a more flexible footprint than many 20W-class models.
CIO says the Pro8K also features a dual-port configuration, allowing simultaneous charging of two devices such as a smartphone and a pair of earbuds[1]. Even at this compact size, the design accounts for users who want to look after several gadgets at once while on the move.
About 120 Minutes to Refill via 20W Input, Plus Full Pass-Through
For recharging the unit itself, the Pro8K accepts 20W input. Paired with a 20W-class charger, CIO says the battery refills from empty in about 120 minutes[1]. Many power banks in this capacity range still need three to four hours to top up, so the ability to recover quickly before heading out is a welcome detail.
The product also supports full pass-through charging[1]. The Pro8K can supply power to a connected device while it is being charged itself. Once the unit reaches a full charge, it automatically switches the connected device over to a dedicated DC line, reducing strain on the internal cells[1]. That makes it well suited to leaving on a desk full-time, or to overnight setups where a phone keeps charging through the morning.
Color Lineup, Release Schedule, and Amazon Smile Sale
The Pro8K is available in two colors: silver and black. Silver went on sale on March 3, 2026, and the new black model becomes available on May 1, 2026[1]. The added choice should make it easier to match the unit to the rest of a desk setup or a phone case.
Sales begin on Amazon.co.jp, followed by gradual rollout to CIO's official online store on Rakuten, select consumer electronics retailers, and the company's directly operated CIO STORE locations[1]. Both silver and black share the manufacturer's suggested retail price of 7,130 yen (tax included).
At the time of writing, CIO notes that the Pro8K is part of the ongoing Amazon Smile Sale, with a 13 percent discount that brings the price to 6,180 yen[1]. Promotional pricing varies with the campaign period and stock levels, so it is worth checking the latest figure on the Amazon product page before purchase.
Amazon.co.jp でチェック
CIO SMARTCOBY SLIMⅡ Pro8K モバイルバッテリー 8000mAh 30W USB-C 薄型 ブラック
Summary
The SMARTCOBY SLIMⅡ Pro8K combines a body about 11mm thin with an 8,000mAh capacity and up to 30W output from a single USB-C port, packaged as a slim daily-carry power bank from CIO. With the new black model joining silver, the lineup now spans two colors, both priced at 7,130 yen (tax included). A roughly 120-minute refill from a 20W charger and full pass-through with automatic switching once topped off speak to a design tuned for everyday commuting. For users who want to keep their bag tidy while still being able to feed tablets and lightweight laptops in addition to smartphones, the Pro8K stands out as a well-considered option.
出典:https://prtimes.jp/main/html/rd/p/000000649.000043212.html
