Here's the translation:

*What is the battery size of a phone?*

The battery size of a mobile phone is primarily measured in "mAh" (milliampere-hour). For example: a 3000 mAh battery is like a small water tank, while a 5000 mAh battery is like a large tank. The larger the tank (i.e., the more mAh), the longer your phone will last.

*Daily life examples:*

1. Household water tank: 3000 mAh = small tank (equivalent to one or two containers) 5000 mAh = large tank (can supply water for several hours)

2. Car fuel tank: Small fuel tank = enough for daily short drives in the city Large fuel tank = possible to travel long distances outside the city

*How to check your phone's battery size?*

*Android phone:*

1. Go to Settings.

2. Tap on Battery or بیٹری.

3. Some phones have a Battery Health option, where you can see the Capacity (e.g., 4000 mAh).

4. If the capacity is not shown, you can search Google for "Your Phone Model battery capacity" to find out.

*iPhone:*

1. Go to Settings > Battery.

2. Tap on Battery Health & Charging.

3. Here, you'll see the Maximum Capacity percentage (e.g., 90%), which indicates how much of the original mAh is still remaining.

4. To find the original mAh, visit Apple's website or search for "battery capacity" along with your phone model.

*Benefits in daily life:*

- If you use WhatsApp or video calls frequently, a larger battery (e.g., 5000 mAh) is better.

- For just calls and messages, 3000 mAh may be sufficient.

- For long trips or navigation use, a higher mAh is essential.

*Summary:*

The higher the battery mAh, the longer your phone will last. Check your battery's actual capacity by going to Settings or searching online with your phone model. Choose a phone that suits your daily needs and usage.