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Universal mobile battery Brevia 30000mAh 15.5W Li-Pol, LCD
  • Brand: Brevia
  • Category: Powerbanks
  • Article: 45315
Battery capacity: 3.7V 30000mAh / 111Wh. Nominal capacity: 18000mAh (5V/3A). Battery type: Li-Polymer. Input Micro USB: 5V-2A, Type C: 5V-3A. Output USB 1-2: 5V-3.1A, Type-C: 5V-3.1A. LED indication. Kit: 1x Power Bank, 1x USB Cable - Type C, 1x User Manual. Warranty: 12 months. The calculation of the actual capacity of the universal mobile battery is done as follows (using a capacity of 20000mAh as an example): The manufacturer specifies a nominal capacity of 20000mAh at a voltage of 3.7V, while regular (non-fast) charging via the USB interface has 5V and above. During conversion, a portion of the capacity is lost, and the faster the charging (5V, 9V, 12V, 15V, 20V), the greater the losses. The charge capacity is calculated by multiplying the nominal capacity by the voltage on the power elements (usually 3.7V), dividing by the USB interface voltage, and multiplying by the coefficient of useful action (which is approximately 85%, i.e., 0.85). For example, with charging at 5V, the actual capacity will be: 20000 * 3.7 / 5 * 0.85 ≈ 12600 mAh, 20000 * 3.7 / 9 * 0.85 ≈ 7000 mAh, 20000 * 3.7 / 12 * 0.85 ≈ 5300 mAh, 20000 * 3.7 / 15 * 0.85 ≈ 4200 mAh, 20000 * 3.7 / 20 * 0.85 ≈ 3200 mAh. This is how all power banks work.
Specification