GoKawiilGuide explains matching power bank capacity to laptop battery needs
A technical explainer breaks down how to calculate the actual energy stored in a power bank by converting its milliamp-hour (mAh) rating into watt-hours (Wh) using battery voltage, typically 3.7V for lithium-ion cells. It notes that a 10,000 mAh bank stores about 37Wh, while modern MacBook batteries range from roughly 37Wh to 100Wh, meaning smaller power banks may not fully recharge larger laptop batteries.