Japanese charging-gear maker CIO has announced that it will take part in the Rakuten Super SALE running from 20:00 on Thursday, June 4, 2026 to 1:59 on Thursday, June 11, 2026, offering its flagship gadgets such as power banks, chargers, and power strips at up to 50 percent off[1]. A wide range of products that can charge the latest smartphones and laptops are included, from the semi-solid-state "SMARTCOBY" series and the compact GaN fast charger "NovaPort" series to the popular "silicone cables."

Sale Overview and Period

This Rakuten Super SALE runs for about one week, from 20:00 on Thursday, June 4, 2026 to 1:59 on Thursday, June 11, 2026[1]. According to CIO, the lineup spans many categories, including the compact, high-output "SMARTCOBY" power bank series, the small GaN fast charger "NovaPort" series, and the easy-to-store "spiral cables," with a maximum discount of 50 percent off[1].

That said, the discount rates published for the individual featured products below mostly fall in the range of about 5 to 20 percent[1]. Because the figure of up to 50 percent represents the maximum across the entire sale, the actual price cut for each product is best confirmed on its Rakuten Ichiba product page. At the "CIO Rakuten Ichiba Store," which serves as the sale window, the eligible products are marked down together[1].

Semi-Solid-State Power Banks Take Center Stage

The core of the sale is the group of power banks built with the semi-solid-state cells that CIO has focused on in recent years. Semi-solid-state cells are said to be less prone to fire than conventional lithium-ion polymer batteries, and CIO combines Tier 1 battery maker cells—also used in the smartphone field—with its own heat-suppression firmware "NovaSafety S2" and its internal-structure design standard "NovaCore C2"[1].

For users who prioritize a slim body, the roughly 8.7mm-thick, Qi2-compatible "SMARTCOBY SLIM II Wireless 2.0 SS5K" is offered at a sale price of 6,180 yen (tax included), 11 percent off[1]. The "SMARTCOBY Ex04 Wireless 2.2 CABLE SS5K," which packs Qi2.2 wireless charging of up to 25W and wired output of up to 20W into a roughly 14mm-thick body and includes a detachable USB-C cable of about 22cm, is 6,480 yen (tax included), 9 percent off[1].

In the 10,000mAh class, the "SMARTCOBY SLIM II Wireless 2.2 Pro SS10K," which supports Qi2.2 fast wireless charging of up to 25W, can be bought for 7,680 yen (tax included), 10 percent off[1]. Because its output can be switched between 7.5W and 25W, users can keep heat down while choosing charging that suits their device. The "SMARTCOBY Pro SLIM SS," with two USB-C ports and one USB-A port and single-port output of up to 35W, is 5,680 yen (tax included), 9 percent off[1].

For users who need large capacity, two models of the 20,000mAh "SMARTCOBY TRIO" series are available[1]. The single-port up-to-35W model is 8,280 yen (tax included) at 10 percent off, and the up-to-67W model is 9,880 yen (tax included) at 10 percent off. The 67W model features CIO's proprietary "NovaIntelligence" control technology, which automatically distributes power according to the connected devices, making it suited to situations where you want a single unit to cover multiple devices including a laptop[1].

World's-Thinnest-Class and Best-Balance Models Also Included

The 8,000mAh "best balance" design aimed at users who feel that "5,000mAh is not enough, but 10,000mAh is too heavy" is also part of the markdown. The "SMARTCOBY SLIM II Pro 8K," with wired output of up to 30W and a MagSafe-compatible magnetic attachment, is 6,180 yen (tax included) at 13 percent off, while the "SMARTCOBY SLIM II Wireless 2.2 8K," which supports wireless charging of up to 25W, is 6,580 yen (tax included) at 17 percent off[1].

In addition, the "SMARTCOBY ULTRA SLIM 3K," billed as a world's-thinnest-class model at 4.98mm thick and about 82g, is also on sale at 8,280 yen (tax included), 7 percent off[1]. Along with MagSafe support and Qi wireless charging (up to 7.5W), it works with Apple's "Find My," making it an easy choice for users who want protection against misplacing it.

Fast Chargers, Power Strips, and Cables Also Discounted

In the charger category, the compact GaN charger "NovaPort SOLO II 65W1C," with up to 65W output and a weight of about 74g, is offered at 3,940 yen (tax included), 10 percent off[1]. The "NovaPort DUO II 45W Built in CORDREEL," which has a built-in USB-C cable of about 65cm and pops the connector out at the press of a button, is 4,280 yen (tax included), 10 percent off, a unit suited to outings where you want to avoid forgetting a cable[1]. The "NovaWave 3Way+," which can wirelessly charge an iPhone and an Apple Watch at the same time, can be purchased for 4,480 yen (tax included), 10 percent off[1].

For power strips, the can-of-coffee-sized, easy-to-carry "Polaris CUBE Built in CABLE" is offered at 4,780 yen (tax included), 20 percent off[1]. The "Polaris STICK Built in CORD REEL," which combines a cord-reel charger with a surge-protected power strip of up to seven outlets, is 6,080 yen (tax included), 20 percent off, a configuration that handles both permanent desk use and taking it out with you[1].

Among cables, the "Flex Spiral Cable CtoC 1m," which has a built-in magnet so it extends when pulled and coils up when released, and its flat-type counterpart the "Flat Spiral Cable CtoC" are each sold at 1,880 yen (tax included), 5 percent off[1]. Because the Flex Spiral Cable CtoC 1m supports PD fast charging of up to 240W and USB 2.0 data transfer, it can also charge a laptop. Other eligible items include the cordless graphene-heater "Hot Eye Mask" (4,580 yen, 16 percent off) and the IPX7-waterproof, magnet-equipped "Portable Bath Speaker" (5,380 yen, 10 percent off)[1].

Coupons Make It Even More of a Bargain

On top of the product markdowns, the Rakuten Super SALE offers limited-time coupons[1]. During the first four hours, from 20:00 to 23:59 on Thursday, June 4, a 10 percent off coupon usable on purchases of 3,000 yen or more is distributed[1].

Throughout the sale period, from 20:00 on Thursday, June 4 to 1:59 on Thursday, June 11, coupons based on the number of items purchased are also available[1]. The design rewards bulk buying with larger discounts: 200 yen off for two or more items, 400 yen off for three or more, 700 yen off for four or more, and 1,000 yen off for five or more[1]. For users who want to round out their setup with a charger, cable, and power strip together, stacking the markdown with coupons makes it easier to keep the real cost down.

Summary

This Rakuten Super SALE has CIO marking down its flagship categories together for about one week from June 4 to June 11, 2026, including the semi-solid-state SMARTCOBY series, the compact GaN charger NovaPort series, cord-reel power strips, and spiral cables. While the maximum discount across the whole sale is stated as 50 percent, the individual featured products center on cuts of about 5 to 20 percent, and using the item-count coupons together makes it an even better deal. From slim-focused power banks to large-capacity models that handle laptops, to users thinking about overhauling their desk power setup, it looks set to be a week in which it is easy to choose by use case.

Source: https://prtimes.jp/main/html/rd/p/000000661.000043212.html