JavaScript - convert mAh to kWh

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                    // e.g. some power bank has:
const mAh = 20000;  //      20000 mAh capacity
const volts = 5.1;  //      5.1 V output

const kWh = (volts * mAh) / 1000000;

console.log(`${kWh} kWh`);  // 0.102 kWh