3.7v Rechargeable Battery 18650

3.7v Rechargeable Battery 18650

A 3.7-volt rechargeable battery with an 18650 form factor is a common type of lithium-ion (Li-ion) battery. 

The designation "18650" refers to the battery's dimensions: 18mm in diameter and 65mm in length. 

These batteries are widely used in various electronic devices, including flashlights, laptops, power banks, and 

medical devices, due to their relatively high energy density and rechargeable nature.

Here are some key features of a typical 3.7V rechargeable 

18650 battery:

1. Voltage: 

The nominal voltage of a single cell is 3.7 volts. However, it's essential to note that the voltage can vary during 

the charge and discharge cycles, typically ranging from about 4.2 volts when fully charged to around 3.0 volts when nearly depleted.

2. Capacity: 

The capacity of 18650 batteries is measured in milliampere-hours (mAh), representing the amount of charge the 

battery can store. Common capacities for 18650 batteries range from around 2000mAh to 3500mAh, though higher-capacity 

models are available.

3. Chemistry: 

18650 batteries are typically lithium-ion (Li-ion) or lithium-ion polymer (Li-Po) cells. Li-ion batteries are known 

for their high energy density, lightweight design, and ability to be recharged.

4. Rechargeability: 

These batteries are rechargeable, and they can undergo hundreds to thousands of charge-discharge 

cycles before experiencing a significant reduction in capacity.

5. Applications: 

3.7V rechargeable 18650 batteries are used in a wide range of applications, including consumer electronics, 

power tools, electric vehicles, and various portable devices. The choice of a specific battery capacity depends on the power 

requirements of the device and the desired runtime between charges.

6. Protection Circuit: 

Some 18650 batteries come with built-in protection circuits to prevent overcharging, over-discharging, 

and short circuits. These protection features enhance the safety of the battery during use.

7. Charging: 

Charging 18650 batteries typically involves using a compatible lithium-ion battery charger. It's important to use a 

charger specifically designed for Li-ion batteries and to follow the manufacturer's guidelines for charging.

When using 3.7V rechargeable 18650 batteries, be sure to follow safety guidelines and best practices to ensure proper 

performance and longevity. Additionally, consider the specific requirements of the device or application in which the batteries are used.