mAh Battery Meaning: The mAh means "milliampere hour". The small capacity of batteries that are used in smartphones and tablets is rated in mAh. Ampere is the unit of current. Milliampere or mA is the smaller unit of current. 1 ampere = 1000 milliampere.

Now the question is what is the meaning of mAh in Battery or why small batteries are rated in mAh? The answer is it indicates the capacity of the battery.

Suppose a battery has a rating 5000mAh. So it indicates that if we connect a load with the battery which draws 5000 mA current then the battery will deliver the power for 1 hour or the battery will fully discharge after 1 hour.

But if we connect a load with that battery which draws 10000mA current then the battery will deliver power for 1/2 hour or 30 minutes.

Now if we connect a load with that battery which draws 1000 mA current then the battery will deliver the power for five hours.

The equation for calculating the power delivering time of the battery is,

So, milliampere-hour (mAh) measures the capacity of a battery by multiplying the current (in milliamperes) that the battery can provide or draw by the time (in hours) for which it can sustain that current.

Actually, our smartphone's batteries are rated in mAh which is why most of the people asked this question and they also asked is more mAh rating battery is better?

Yes, if your smartphone battery has more mAh rating then it is good. The power delivery time also depends upon the use of the smartphone. When we keep our phone in flight mode it draws very less current so in this case, the charge in the battery last for a long time but when we use the Internet, recording high-quality videos then our phone draws a very large amount of current, and in this case the battery discharge quickly.

Don't confuse with mAh and Ah. mAh is commonly used to express the capacity of small-scale batteries, such as those found in portable electronic devices like smartphones, tablets, and cameras. These batteries typically have capacities in the range of a few hundred to a few thousand milliampere-hours.

On the other hand, Ah is typically used to express the capacity of larger-scale batteries, such as those used in electric vehicles, renewable energy storage systems, or industrial applications. These batteries can have capacities ranging from a few ampere-hours to several hundred ampere-hours or even more.

Some batteries are rated in Watt-Hour which also indicates the capacity of the battery.

Watt-hour (Wh) is calculated by multiplying the voltage (V) of the battery by the ampere-hour (Ah) capacity of the battery. The formula is:

Wh = V * Ah

For example, if a battery has a voltage of 12 volts (V) and an ampere-hour capacity of 5 ampere-hours (Ah), the watt-hour rating would be:

Wh = 12 V * 5 Ah = 60 Wh