Do you know how many times a power bank can charges phone / tablet? Let see formula below:
Calculation of the conversion rate power bank:
Formula: power bank capacity X 0.8 (about 20% loss) / mobile phone battery capacity = charging times (approximately)
EXAMPLE: Power Bank capacity 11200mah, Mobile phone battery capacity 3100mAh
Formula: 11200mAh X 0.8 / 3100mAh = around 2.89 times
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