Murata purchased Sony battery line in 2019 and is now producing batteries with the same high performance and reliability, taking advantage of 40+ years of technology development and manufacturing expertise. These Murata CR2430 batteries are the perfect long lasting replacement for all your personal devices including keyfobs, blood sugar monitors, remote controls, digital thermometers, toys, calculators and more. Operating temperature: -30°C to +70°C (standard) -40°C to +125°C (heat-resistant). Nominal Capacity: 300mAh.