CIO Inc. has announced the second wave of its lineup for Amazon's "Prime Day," held in July 2026[1]. The highlights this time are mobile batteries built with semi-solid cells designed to be more resistant to ignition, along with the popular "SMARTCOBY" series. Including the early-access sale, the products are available at sale prices for about a week, ranging from slim wireless models to high-capacity 20,000mAh units.
Pursuing Fire Resistance with Semi-Solid Cells
The core of this lineup is a group of models that adopt semi-solid battery cells[1]. Compared with conventional lithium-ion polymer batteries, semi-solid cells are a next-generation battery designed to reduce the risk of ignition, making them well suited to users who prioritize safety. In addition to these cells, CIO says it raises the safety level by combining its proprietary heat-suppression firmware "NovaSafety S2" and "NovaCore C2," an in-house design standard for internal structure[1].
For example, the "SMARTCOBY SLIMⅡ Wireless2.0 SS5K" carries a semi-solid cell made by a Tier 1 battery maker with a track record in the smartphone field, while combining an 8.7mm slim design with an aluminum-alloy housing[1]. It supports up to 15W wireless charging under the Qi2 standard and has a 5,000mAh capacity. The sale price is 5,980 yen (tax included, 14% off).
A Semi-Solid Lineup You Can Choose by Use Case
The semi-solid models can be chosen by use case, from slimness-focused to high-capacity. For those who tend to forget their cables, the "SMARTCOBY Ex04 Wireless2.2 CABLE SS5K" packs an approximately 22cm detachable USB-C cable into a roughly 14mm slim body[1]. It supports up to 25W wireless charging via Qi2.2 and up to 20W wired output, with a 5,000mAh capacity. The sale price is 5,980 yen (tax included, 16% off).
If you also want to charge a laptop, the 10,000mAh "SMARTCOBY Pro SLIM SS" with up to 35W single-port output is a candidate[1]. With two USB-C ports and one USB-A port, it supports charging up to three devices at once as well as pass-through charging, and a digital readout on the surface shows the charging status at a glance. At 4,980 yen (tax included, 21% off), it has a relatively high discount rate among this round's semi-solid models.
For those wanting high capacity, the 20,000mAh "SMARTCOBY TRIO" series is available[1]. The "TRIO 35W SS," with up to 35W single-port output, is easy to carry for its class at about 320g, and its sale price is 7,480 yen (tax included, 19% off). The higher-output "TRIO 67W SS" supports up to 67W single-port output and features CIO's proprietary control technology "NovaIntelligence," which automatically distributes power according to the connected device. Its sale price is 8,880 yen (tax included, 19% off).
The "SMARTCOBY" Series Refined for Slimness and Light Weight
The standard "SMARTCOBY" series also includes slim, lightweight models in the sale. The "SMARTCOBY SLIM II Pro 8K" is an 8,000mAh model with a MagSafe-compatible magnetic attachment in a roughly 11mm-thick, about 161g body, and supports up to 30W wired output[1]. With a middle-ground capacity aimed at people who find 5,000mAh insufficient and 10,000mAh too heavy, its sale price is 5,480 yen (tax included, 23% off), the largest discount rate this time.
Portability is taken to an extreme with the "SMARTCOBY ULTRA SLIM 3K"[1]. This magnetic model, billed as among the world's thinnest at 4.98mm thick and about 82g, is designed for a sense of unity that barely protrudes even when attached to an iPhone. In addition to MagSafe compatibility and Qi wireless charging (up to 7.5W), it supports Apple's "Find My" to help guard against misplacement. With a 3,000mAh capacity, its sale price is 7,980 yen (tax included, 11% off).
Sale Period and Pricing Basis
The "Prime Day early-access sale" runs from July 7 to July 9, 2026, and the main "Prime Day" runs from July 10 to July 13, with sale prices available throughout both periods[1]. Note that sales end as soon as stock runs out. CIO also states that the regular prices and discount rates shown this time are figures calculated based on the suggested retail prices on its official website as of June 19, 2026[1]. Details of the eligible products are compiled on CIO's Prime Day special page[2].
Summary
CIO's second Prime Day wave centers on mobile batteries that combine the safety of semi-solid cells with practical features such as wireless charging, high capacity, and slim design. Discount rates range from 11% to 23%, with well-balanced models in terms of capacity and price standing out, such as the semi-solid "SMARTCOBY Pro SLIM SS" and the slim "SLIM II Pro 8K." For anyone who wants to rethink their charging setup while prioritizing safety, it looks like a sale worth considering.
出典:https://prtimes.jp/main/html/rd/p/000000668.000043212.html
