Charger maker CIO Co., Ltd. has refreshed three models in its popular SMARTCOBY power bank series with semi-solid battery cells, putting them on sale from March 27, 2026 through Amazon.co.jp, the CIO official online store on Rakuten, selected electronics retailers, and its directly run CIO STORE outlets[1]. The lineup covers the slim "SMARTCOBY Pro SLIM SS" and the high-capacity "SMARTCOBY TRIO 35W SS20000mAh" and "SMARTCOBY TRIO 67W SS20000mAh"[1].

Three SMARTCOBY Models Adopting Semi-Solid Cells

The common change across this refresh is the switch to semi-solid battery cells, while the models otherwise carry over the usability of their predecessors[1]. SMARTCOBY is CIO's flagship power bank series, with several products that address different needs such as slimness, high capacity, and high output. All three models come in black and white, with prices ranging from 6,280 yen to 10,980 yen including tax[1].

CIO, founded in 2017, focuses on smartphone-related products such as chargers and power banks, developing its own in-house products[1]. This series refresh can be seen as one effort to raise the safety and performance baseline of that in-house lineup.

The Slim 10,000mAh "SMARTCOBY Pro SLIM SS"

The "SMARTCOBY Pro SLIM SS" combines a slim design of about 16mm with a 10,000mAh capacity[2]. It supports up to 35W output on a single port and carries three ports in total, two USB-C and one USB-A, so it can handle multiple devices and a variety of cables[2].

It also supports pass-through charging, which lets it power connected devices while the unit itself is being charged, and a digital remaining-capacity display on the surface makes it easy to check the battery level and charging status[2]. The manufacturer's suggested retail price is 6,280 yen including tax, the most accessible price among the three models[2].

The High-Capacity 20,000mAh "TRIO 35W" and High-Output "TRIO 67W"

The "SMARTCOBY TRIO 35W SS20000mAh" packs a large 20,000mAh capacity while keeping the body to 91.5mm x 68.8mm x 29.5mm and a weight of about 330g[3]. It supports up to 35W output on a single port with a three-port layout of two USB-C and one USB-A, and the unit itself can be recharged at up to 35W input[3]. Positioned to balance capacity, output, and portability, it is priced at 9,280 yen including tax[3].

The "SMARTCOBY TRIO 67W SS20000mAh" offers the same 20,000mAh capacity but with higher output[4]. While keeping a card-sized footprint, it supports up to 67W output on a single port and can charge up to three devices at once via its three ports, two USB-C and one USB-A[4]. It features CIO's proprietary power control technology "NovaIntelligence" (a mechanism that automatically distributes output according to the connected devices), which the company says allows comfortable charging even when several devices are connected at once[4]. The price is 10,980 yen including tax[4].

Whereas the 35W model is an everyday option balancing cost and capacity, the 67W model can be seen as a model aimed at higher-output charging, including laptops.

About the Term "Semi-Solid"

The "semi-solid battery" adopted in these three products refers to a configuration positioned between the common lithium-ion battery, which uses a liquid electrolyte, and the all-solid-state battery. It is drawing attention as a technology that aims to reduce the risk of fire and leakage, for example by reducing the amount of electrolyte.

That said, CIO states that there is currently no official standard or industry-wide definition for semi-solid batteries, and that "semi-solid" is an operational term based on the company's own definition, derived from cell specifications, test conditions, and measured data[1]. When considering a purchase, it seems wiser to check each product's actual specifications, such as capacity, output, and size, rather than the term itself.

Summary

CIO has refreshed three products with semi-solid battery cells and released them on March 27, 2026: the slim "SMARTCOBY Pro SLIM SS" (6,280 yen including tax), the high-capacity "SMARTCOBY TRIO 35W SS20000mAh" (9,280 yen), and the high-output "SMARTCOBY TRIO 67W SS20000mAh" (10,980 yen)[1]. Each carries over the usability of its predecessor while letting users prioritize slimness, capacity, or output depending on the intended use.

Source: https://prtimes.jp/main/html/rd/p/000000637.000043212.html

Source: https://connectinternationalone.co.jp/cioproduct/mobilebattery/smartcoby/cio-mb35w2c1a-ssa10k-s/

Source: https://connectinternationalone.co.jp/cioproduct/mobilebattery/smartcoby/cio-mb35w2c1a-ssa20000/

Source: https://connectinternationalone.co.jp/cioproduct/mobilebattery/smartcoby/cio-mb67w2c1a-ssa20000/