Phone Battery: The mAh (milliampere-hour) rating on a smartphone battery is used to measure how long the battery can supply its rated current!

Phone Battery:  The mAh (milliampere-hour) rating on a smartphone battery is used to measure how long the battery can supply its rated current. It indicates the amount of energy stored in the battery.

How to calculate mAh:

mAh = (Battery Capacity (Ah)) x 1000

Where:

Battery Capacity (Ah): This is measured in ampere-hours (Ah), which indicates how many amperes of current the battery can deliver for 1 hour.

1000: This is the conversion factor that converts Ah to mAh.

Example:

Suppose you have a battery of 3000 mAh. This means it can provide 3 ampere current for 1 hour, or 1.5 ampere current for 2 hours, and so on.

The higher the mAh rating, the longer the battery will last. However, it is important to note that battery life is also affected by several other factors, such as:

How the phone is used: If you play games or stream videos the battery will drain faster as these activities use more power.

Screen brightness: High screen brightness will drain the battery faster. 

Network connectivity: Areas with weak signals require the phone to use more power, which drains the battery faster. 

Background apps: Apps running in the background can drain your battery, even if you're not actively using them. 

There are a few things you can do to improve your smartphone's battery life:

Lower the screen brightness. 

Close background apps.

Turn off Wi-Fi or data in areas with poor signal.

Use battery saver mode.

Update your phone regularly.

Replace your battery if it's old.