The Renata CR1025 is a high-quality 3V lithium coin cell (Li/MnO₂) with a 30 mAh capacity, measuring 10 × 2.5 mm and weighing just 0.6 g. Made in Switzerland, it offers excellent reliability, long shelf life with <1% annual self-discharge, and an operating range of –40 °C to +85 °C, making it ideal for compact, long-lasting electronic devices.