The application of 18650 lithium battery

The 18650 lithium battery is a cylindrical lithium battery with a diameter of 18mm and a length of 65mm. It features high energy density, long cycle life, and stable discharge performance, and is widely used in multiple fields. Specific applications are as follows:
1. Consumer electronics
Laptops: Early mainstream laptops often used a combination of multiple 18650 lithium-ion batteries for power supply. Their high energy density can meet the long-term operation requirements of the device. For example, the battery pack core of some old Lenovo and  laptops is 18650 cells. ​
Flashlights and headlamps: High-intensity flashlights and outdoor headlamps have high requirements for battery life and discharge intensity. 18650 lithium batteries can provide continuous and stable current, and are compatible with LED light sources of various power levels, making them a common battery type for outdoor lighting equipment. ​
E-cigarettes: Most e-cigarette devices are powered by a single 18650 lithium battery, which, with its compact size, fits well with the portable design of e-cigarettes. Additionally, its rechargeable nature reduces usage costs. ​
II. Portable device field
Portable power banks: Some medium and large-capacity portable power banks utilize 18650 lithium-ion batteries as the core energy storage component. By connecting multiple cells in series or parallel, they achieve capacities ranging from thousands to tens of thousands of milliampere-hours, meeting the emergency charging needs of devices such as smartphones and tablets. ​
Bluetooth speakers: To balance battery life and size, small portable Bluetooth speakers often use 18650 lithium-ion batteries. Compared to ordinary dry batteries, these batteries have a larger capacity and more stable discharge, allowing the speakers to play continuously for several hours. ​
III. Electric vehicle sector
Electric bicycles and scooters: Entry-level or small electric bicycles and electric scooters use multi-cell 18650 lithium-ion batteries to form a battery pack, providing the power source. Their lightweight characteristics help reduce the overall weight of the vehicle and increase its range. ​
Small electric vehicles: Some low-speed small electric vehicles (such as elderly scooters and scenic area sightseeing buses) also adopt 18650 lithium battery packs. Through reasonable cell arrangement and protection circuit design, they meet the power and safety requirements of the vehicles. ​
IV. Energy Storage and Emergency Equipment Sector
Household energy storage system: In the distributed photovoltaic energy storage scenario, 18650 lithium batteries can be assembled into a small energy storage battery pack to store the electric energy generated by photovoltaic power during the day, which can be used for household lighting and small appliances at night, achieving rational energy utilization. ​
Emergency power supply: Portable emergency power supplies (such as outdoor camping emergency power supplies and household emergency backup power supplies) often use 18650 lithium-ion batteries as their core, providing 220V AC output to power devices such as mobile phones, laptops, and small household appliances, in response to power outages or outdoor power-free scenarios. ​
V. Special equipment field
Medical equipment: Some portable medical devices, such as blood glucose meters, small monitors, and handheld ultrasound devices, utilize 18650 lithium-ion batteries for power supply. Their stable discharge performance and long cycle life ensure reliable operation of the medical equipment. ​
Industrial equipment: In the industrial sector, devices such as small inspection robots and wireless sensor nodes, due to limited installation space and long-term operation requirements, can benefit from the compact size and long-lasting battery life of 18650 lithium-ion batteries to meet their power supply needs, while also adapting to the temperature range requirements of industrial environments.