This Tiny Battery Charges Wirelessly Through Sealed Walls and Survives 150°C

Maxell, a Japanese company, has built a rechargeable all solid-state battery that charges wirelessly through sealed walls, lasts up to 20 years, and works at 125°C to 150°C. It fits in a half AA size casing and delivers 3.6V, so it can directly replace non-rechargeable lithium thionyl chloride ER batteries used in smart meters, IoT sensors, and industrial backup systems. In this video, we explain in simple language what a solid-state battery is, why this sulfide-based design has no leakage or fire risk, how it differs from semi-solid-state batteries, and why solid-state batteries are already shipping in small devices before cars. CHAPTERS 0:00 Japan Wins the Solid-State Battery Race 0:45 Maxell's Rechargeable All Solid-State Battery 1:30 Half AA Size Module Explained 2:30 Why Primary Cell ER Batteries Are a Problem 3:30 3.6V, Wireless Charging Through Sealed Walls 4:45 Sulfide-Based Chemistry and Kyocera Ceramic Packaging 5:30 What Is an Electrolyte? Solid vs Liquid Explained 6:30 No Leakage, No Fire Risk, 20-Year Life 7:00 Survives 125°C and 150°C: Heat Resistance Compared 8:00 Real-World Use: Subaru Plant and Kyocera Facility 8:40 Full-Size ER Module (35 mAh) and the New Half AA 9:10 Limitations: No Launch Date, Custom Chargers 9:40 Bigger Picture: Medium-Size Cells by 2027 QUICK ANSWERS What is the Maxell half AA solid-state battery? A rechargeable all solid-state module, 14.5 mm wide and 25 mm tall, with built-in wireless charging and a 3.6V output. What is it designed to replace? Non-rechargeable lithium thionyl chloride ER batteries in smart meters, IoT sensors, and industrial backup systems. Is it truly solid-state? Yes. It uses a sulfide solid electrolyte with zero liquid inside, so it is not semi-solid-state. How hot can it get? One version works up to 125°C and another up to 150°C (over 300°F), far beyond what liquid-electrolyte batteries such as NMC, LFP, or sodium can handle. How long does it last? Maxell rates the design life at up to 20 years. Is it available to buy? Not yet. No commercial launch date has been announced, and the charger must be customized for each customer's equipment. What's next? Maxell plans mass production of medium-size cells by the end of 2027. TOPICS COVERED solid-state battery, Maxell solid-state battery, all solid-state battery, wireless charging battery, sulfide solid electrolyte, ER battery replacement, smart meter battery, IoT sensor battery, Kyocera, rechargeable battery, heat-resistant battery, solid-state vs semi-solid-state What do you think: will solid-state batteries take off first in small devices or in cars? Tell us in the comments. #solidstatebattery #maxell #batterytechnology #iqfunda