Q: Why does the power bank claim to support 45W output, but doesn't always reach the maximum power during use?

A: 

1. The maximum charging power varies across different devices, largely due to the different charging protocols supported by various smartphone brands. Although the power bank can output up to 45W, the actual charging power delivered depends on the connected device's specific needs and compatibility. Below is a table indicating the maximum reference power for common devices and whether the power bank supports them:

Smartphones:

Tablets:

Note:

A 10,000mAh capacity is generally insufficient for laptops. We recommend selecting a power bank with a capacity of 20,000mAh or more for laptop charging.

2. Even if the power bank can continuously provide the maximum specified power for a device, smartphones or tablets may not always charge at their maximum power due to various factors:

1. Battery Management System (BMS)

The BMS in devices dynamically adjusts charging power to preserve battery health. Factors that may reduce charging power include:

• Battery Above 80%: Devices often reduce power once the battery level exceeds 80% to minimize wear.

• High Battery Temperature: To prevent aging or damage, devices may limit power or pause charging if they overheat.

• Aging Battery: Older batteries may receive reduced power to prevent overheating or safety risks.

2. Device Overheating (Thermal Protection)

When the temperature of a device becomes excessively high, its system will automatically reduce the charging power to prevent damage. Potential causes of overheating include:

• High Ambient Temperature: For instance, charging a device inside a car on a hot summer day.

• Active Device Usage During Charging: Activities such as playing games, streaming videos, or using camera functions can significantly increase device temperature.

• Poor Heat Dissipation: Using a thick protective case may trap heat.

3. Limited Power at Low Battery Levels

Some devices do not immediately charge at maximum power when the batteries are critically low (0 - 10%). Instead, they commence charging at a lower power and gradually increase as the battery charges:

• iPhone / iPad: At under 10% battery, these devices might begin charging at a reduced rate of 5W - 10W, progressively escalating to above 20W as the battery charges.

• Samsung / HUAWEI Devices: When the battery level is low, these devices might initially charge at a slower rate of 10W - 15W. As the battery level increases, the charging power can ramp up to 45W or more.

This power bank is capable of fast charging for most smartphones, tablets, smartwatches, and earbuds. However, the actual charging speed may vary based on the device model, battery level, and ambient conditions. It is important to understand that power fluctuations are normal and that the system automatically manages charging efficiency and safety.