Product descriptions from the supplier High Capacity: 500mAh provides long-lasting power for extended use. Compact Design: 453040 size fits neatly into small devices. Long Cycle Life: 800 cycles ensure durability and reliability. Wide Operating Temperature: Works efficiently from -20°C to 60°C. Made in China: High-quality components for consistent performance. Built-in Protection Circuit: Guards against overcharge, overdischarge and short circuit. Stable 3.7V Output: