#Japan #KOHAKU Japan #Surron #E-Battery #Katsushika-ku, Tokyo

KOHAKU Japan's New Semi-Solid Mobile Battery Series

In November 2025, KOHAKU Japan, a company renowned for its electric mobility solutions like Surron electric motorcycles and Okawa power units for electric bicycles, will unveil its latest innovation: a new line of semi-solid mobile batteries. These batteries, featuring a capacity of 5,000mAh and 10,000mAh, are the product of extensive expertise in design, development, and manufacturing gained through years of experience in secondary battery technology from its group company E-Battery.

As smartphones and mobile devices become increasingly powerful, the demand for rapid charging and prolonged usage times is rising sharply. Traditional lithium-ion batteries, however, have faced challenges including overheating, expansion, and fast degradation. KOHAKU's new solution introduces a semi-solid lithium-ion battery that partially integrates solid electrolytes, significantly reducing the risk of fire while achieving both high output and longevity.

Key Features of KOHAKU's New Semi-Solid Mobile Batteries

1. High Safety Standards:
- The semi-solid construction mitigates the risks associated with electrolyte leakage and cell expansion. In the unlikely event of an internal short circuit, the rise in heat is contained, allowing for safer usage.

2. Long Lifespan:
- Thanks to the excellent safety of the electrolytes, these batteries exhibit minimal capacity degradation even after 2,000 charge and discharge cycles, ensuring they last longer than traditional options.

3. Enhanced Low-Temperature Performance:
- These batteries remain reliable and stable in temperatures as low as -10°C due to the semi-solid cell structure, making them perfect for outdoor activities like camping and skiing.

4. High Capacity and Output:
- Designed for efficiency, the batteries support a maximum output of 20W PD through USB Type-C, allowing for rapid charging of smartphones and tablets with an energy conversion efficiency of over 84%.

5. Wireless Charging Capabilities:
- With support for wireless charging up to 15W, users can simply place their smartphones on the battery to initiate charging without the need for cables.

Compact Design Meets High Capacity

• - For the 5,000mAh Model: Capable of fully charging an iPhone 16 approximately 1.1 to 2 times.
• - For the 10,000mAh Model: Able to fully charge an iPhone 16 roughly 2 times. (Note: These figures are based on internal test conditions.)

Lightweight and Portable

The internal structure has been optimized to make the batteries lightweight and easily portable, making them ideal for commuting, travel, or any on-the-go scenario.

Reassuring Safety Features

In addition to the semi-solid battery technology, KOHAKU incorporates multilayered safety mechanisms for electrical and physical control. These extensive protections address risks like short circuits, overcharging, discharging, temperature anomalies, and low-load circumstances.

When overcharging, over-discharging, or experiencing a short circuit, the device triggers automatic protection, ensuring safe management of the battery. This dynamic temperature control logic surpasses standard “battery protection” features found in typical mobile battery designs.

KOHAKU has also conducted rigorous reliability tests on the batteries, including:

• - Needle Penetration Test: No smoke or fire occurred even when penetrated.
• - Drop, Vibration, and Temperature Cycle Tests: Stability under harsh conditions was verified.
• - Terminal Durability Testing: Type-C ports withstand up to 3,000 insertions.
• - Low-load and No-load Auto Shut Off: Automatic shut down occurs in about 30-40 seconds without load.

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