Maxell Unveils Rechargeable Solid-State Module Compatible with ER Cell Size

Maxell, Ltd. has launched an all‑solid‑state battery power module designed to match the size and output performance of standard lithium thionyl chloride (ER) batteries. Measuring 17.9 mm in diameter and 50.0 mm in height, the module provides a nominal voltage of 3.6 V—the same as conventional ER cells used in industrial backup systems, smart meters, and IoT sensors.

Unlike disposable ER batteries, which need regular replacement, Maxell’s solution integrates eight mass‑produced “PSB401010H” all‑solid‑state cells connected in parallel, offering a capacity of about 35 mAh. The module includes an onboard charging circuit that supports 5 V USB 2.0 Micro‑B input and follows a 12‑hour constant current/constant voltage charging profile. It maintains reliable operation across a broad temperature range, from –20 °C to +125 °C during charging and –40 °C to +125 °C during discharge.

By providing a rechargeable drop‑in alternative to ER batteries, Maxell aims to cut maintenance frequency and downtime in industrial settings while extending equipment uptime. The reusable design also helps reduce the disposal of single‑use batteries, supporting environmental goals by minimizing waste.

Maxell remains focused on improving all‑solid‑state battery technology across four key areas: high reliability, thermal stability, high output, and greater capacity. At the same time, the company is advancing modules that combine solid‑state cells with wireless power transfer and energy‑harvesting technologies. These initiatives reflect Maxell’s wider strategy to tackle societal needs, expand the use of solid‑state batteries where conventional chemistries fall short, and promote a sustainable energy ecosystem.