In order to determine how many times a 20,000 mAh power bank can charge your phone, you need to know your phone's battery capacity. A 20,000 mAh power bank theoretically holds enough power to charge a 2,000 mAh phone battery 10 times. However, due to efficiency losses during charging and discharging, the actual number is typically lower.
Here's a simple formula you can use:
(Power Bank Capacity * 0.8) / Phone Battery Capacity = Total Charge Times
The 0.8 in this formula accounts for energy lost during the charging process due to heat generation and voltage conversion, typically around 20–30%.
For example:
If you have an iPhone 12 Pro, which has a 2815 mAh battery:
(20,000 mAh * 0.8) / 2815 mAh = approximately 5.68 times
This means a 20,000 mAh power bank could hypothetically charge an iPhone 12 Pro about 5 to 6 times. Remember, the actual number may be lower due to various factors.
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