Maxell Breaks Barriers: New PSB2032 Solid-State Battery Delivers 4x Capacity for IoT

On December 16, 2025, Maxell announced a significant breakthrough in battery technology with the development of the PSB2032, a new coin-type all-solid-state battery designed specifically for the Internet of Things, or IoT, sector. This new model addresses one of the most critical challenges in the industry: energy density.

A Quantum Leap in Capacity

The headline feature of the PSB2032 is its impressive capacity of 35 milliampere-hours. To put this in perspective, this is approximately four times the capacity of Maxell's currently mass-produced ceramic package type all-solid-state battery, the PSB401010H. This dramatic increase allows the PSB2032 to serve not just as a backup power source, but as the main power supply for various IoT devices, significantly extending their operational lifespan without increasing their physical footprint.

Uncompromising Durability and Safety

Solid-state batteries are renowned for their safety, and the PSB2032 is no exception. It employs a sulfide-based solid electrolyte, which eliminates the risk of leakage associated with traditional liquid electrolytes. Maxell has achieved a high degree of hermeticity comparable to ceramic packages, boasting a helium leak rate at the level of ten to the power of negative eleven Pascal cubic meters per second.

Furthermore, the battery is engineered to perform in extreme environments. It maintains reliable operation across a vast temperature range, from negative 50 degrees Celsius up to positive 125 degrees Celsius. This makes it an ideal solution for industrial sensors, outdoor infrastructure monitoring, and automotive applications where temperature fluctuations are severe.

Market Implications

Sample shipments are scheduled to begin in late December 2025. As the IoT market expands into more demanding environments—from factory automation to smart city infrastructure—the demand for power sources that combine high energy density with extreme durability is skyrocketing. Maxell's PSB2032 positions the company at the forefront of this shift, offering a viable solution for "install-and-forget" devices that require long-term reliability.