They are Li-ion rechargeable batteries with a nominal voltage of 3.7V.
Capacity: The batteries in the image are labeled with a capacity of 1300mAh, although other capacities like 800mAh, 900mAh, 1000mAh, 1100mAh, 1200mAh, and 1500mAh are also available for 18350 batteries.
Applications: They are used in various electronic devices requiring high energy density, such as flashlights, headlamps, remote controls, electronic atomizers, toys, and other portable power applications.
Features: These batteries are designed for long-lasting power and often include safety features like protection against overcharge, overcurrent, overvoltage, short circuits, and reverse polarity. Many are also rechargeable for hundreds of cycles.