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To get a rough estimate, you can use the following formula: (Number of recharges) = (Power bank capacity in mAh) * (Efficiency) / (Phone battery capacity in mAh) For example, if you have a phone with a 3000mAh battery and we assume an efficiency of 80%, the calculation would be: (Number of recharges) = (20000mAh) * (0.8) / (3000mAh) (Number of recharges) = 16000mAh / 3000mAh (Number of recharges) ≈ 5.33
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