“When fully charged, how many times will this likely be able to charge a Samsung Galaxy S21 before needing a recharge?”
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We would firstly let you know that the battery is able to supply 60%-70% power to other devices. Approximately 30-40% of the battery capacity is unable to be used because of efficiency problems that affect all electronics devices. These include power lost from circuit heat and voltage conversions from the battery, the charging cable and your device. To calculate roughly how many times the battery should charge your device you can use this formula: Capacity of the PowerCore*0.6~0.7) / Capacity of your device = Number of possible charges 20000 mAh * 0.6~0.7 /4000 mAh (Samsung Galaxy S21) = 300% to 350% From your description, this battery can charge 3 times to your Samsung Galaxy S21
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