400mAh

400mAh, or 400 milliampere-hours, is a unit of electric charge commonly used to describe the capacity of batteries, particularly in portable electronic devices. It represents the amount of charge that a battery can deliver over a period of time. For example, a 400mAh battery can deliver 400 milliamperes of current for one hour, or 200 milliamperes for two hours, and so on.

The term "mAh" is often used interchangeably with "mAh" or "mAh" in technical contexts. The capacity of a battery is a crucial factor in determining its performance and longevity. A higher mAh rating generally indicates a longer battery life, assuming the battery is used under similar conditions.

In the context of portable electronics, a 400mAh battery is considered relatively small. For instance, a typical AA alkaline battery has a capacity of around 2000mAh to 3000mAh, while a smartphone battery might range from 2000mAh to 5000mAh or more. The capacity of a battery is influenced by factors such as its size, chemistry, and manufacturing process.

It's important to note that the actual runtime of a device depends not only on the battery capacity but also on the power consumption of the device and the efficiency of the battery. A device with a higher power consumption will drain a 400mAh battery more quickly than a device with a lower power consumption.

In summary, 400mAh is a unit of measure for battery capacity, indicating the amount of charge a battery can deliver. It is a crucial factor in determining the performance and longevity of portable electronic devices.