Power bank watt-hours determine safe laptop charging capacity
Engadget explains how to calculate watt-hours to find a power bank capable of safely charging a laptop.
Calculating true energy storage
Most power banks list capacity in milliamp-hours, but users must multiply this value by voltage to get watt-hours. Lithium-ion cells typically operate at about 3.7 volts. A 10,000 mAh bank stores roughly 37Wh before conversion loss occurs.
Matching output to drain
A proper laptop power bank must store enough energy and charge faster than the device drains it. Users should find the watt-hour rating of their specific laptop battery on the manufacturer website. Doubling the milliamp-hour count doubles the watt-hours as long as voltage stays consistent.
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