How many times can I charge my phone with this power Bank

The 20,000mAh capacity refers to the total amount of power that the internal battery can store. However, during the charging process, energy is lost in the following two stages:
1. Conversion in the Power Bank: The battery's voltage is converted to match the output voltage required by your device.
2. Conversion in the Device: Your device then converts the incoming voltage again to match its own battery cells.
Additionally, a small amount of power is lost through the resistance of the charging cable or heat generated.
These factors result in an industry-standard energy loss of about 30%–40%, which is completely normal and not considered a defect.

As a result, the actual usable capacity of a 20,000mAh power bank is approximately 12,000 to 14,000mAh, which is enough to fully charge an iPhone 15 Pro (battery capacity: 3,274mAh) about 3.5 to 4 times.

Tip: Charging efficiency may decrease if you use your phone heavily while charging or if the ambient temperature is low. For the best performance, try to avoid using your phone during charging and keep the power bank stored at room temperature.
If you notice a significant difference between the expected and actual charging performance, feel free to contact us at support@iniu.shop. We’ll respond within 24 hours.