What is the most common type of battery used in portable electronics?

The most common type of battery used in portable electronics is the lithium-ion battery. These rechargeable batteries have become the standard power source for a wide range of portable devices such as smartphones, laptops, tablets, and digital cameras.

Lithium-ion batteries are preferred over other types of batteries for several reasons. They have a high energy density, which means they can store a lot of energy in a relatively small size. They also have a low self-discharge rate, which means they can hold a charge for a long time without being used. In addition, they have no memory effect, so they can be charged and discharged at any time without damaging the battery's lifespan.

While lithium-ion batteries are the most common type of battery used in portable electronics, there are other types of batteries that are also used, such as nickel-metal hydride (NiMH) batteries and alkaline batteries. However, these types of batteries are less common because they have lower energy density and are not rechargeable.