14500 batteries, also known as AA lithium-ion batteries, are rechargeable batteries that are the same size as a traditional AA battery. However, these batteries provide a higher voltage output due to their lithium-ion chemistry. A single 14500 battery can provide a voltage of 3.7 volts and have a capacity of up to 900mAh, making them a popular choice for high-performance flashlights, remote controls, and other electronics. These batteries are also used in powerful LED torches and portable power banks because of their high energy density and longer battery life. 14500 batteries are also environmentally friendly, as they can be recharged thousands of times, reducing waste compared to traditional alkaline batteries. Overall, the 14500 battery is an excellent choice for those looking for a higher voltage, rechargeable battery option in the same form factor as a standard AA battery.