<article>
  <p><strong>A heated cushion uses surprisingly little electricity</strong> – especially compared with other household appliances. A portable rechargeable heated seat cushion is even more energy-efficient because it’s optimised to make the battery last as long as possible. Below we calculate how much electricity a heated cushion actually uses – step by step.</p>

  <p><a href="https://dynan.se/products/sittdyna-med-varme">See our rechargeable heated seat cushion</a></p>

  <h2>1. How much energy is in the power bank?</h2>
  <p>In this example we use a heated cushion powered by a <strong>20,000 mAh</strong> (20 Ah) power bank at <strong>5 V</strong>. We’ll work out the total energy in watt-hours (Wh):</p>

  <p><em>Energy = Capacity (Ah) × Voltage (V)</em></p>
  <p><strong>20 Ah × 5 V = 100 Wh</strong></p>

  <p>The power bank can therefore store a total of <strong>100 Wh</strong> of energy, which equals <strong>0.1 kWh</strong>.</p>

  <h2>2. Power draw per hour</h2>
  <p>If the heated cushion runs for up to <strong>15 hours</strong> on one charge, we can estimate the hourly electricity use:</p>

  <p><em>100 Wh ÷ 15 h ≈ 6.7 W</em></p>
  <p>So the cushion draws on average only <strong>6.7 watts per hour</strong>.</p>

  <table>
    <thead>
      <tr>
        <th>Product</th>
        <th>Power (W)</th>
        <th>Consumption per hour</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>Heated seat cushion</td>
        <td>≈ 6.7 W</td>
        <td>0.0067 kWh</td>
      </tr>
      <tr>
        <td>Laptop</td>
        <td>50–60 W</td>
        <td>0.05–0.06 kWh</td>
      </tr>
      <tr>
        <td>Incandescent bulb (60 W)</td>
        <td>60 W</td>
        <td>0.06 kWh</td>
      </tr>
    </tbody>
  </table>

  <h2>3. How much does it cost to run?</h2>
  <p>Assume an electricity price of <strong>2 SEK/kWh</strong>. Then the cost is:</p>

  <p><em>0.1 kWh × 2 SEK/kWh = 0.2 SEK</em></p>
  <p>That means you can use the cushion for <strong>up to 15 hours for just SEK 0.20</strong>!</p>

  <figure>
    <img src="https://dynan.se/cdn/shop/files/dynan-sittdyna.webp" alt="Rechargeable heated seat cushion – an energy-efficient heat source" width="1200" height="800" loading="lazy">
    <figcaption>A heated seat cushion warms the body directly – using barely any electricity at all.</figcaption>
  </figure>

  <h2>4. Comparison with other devices</h2>
  <ul>
    <li>💡 A 60 W bulb uses <strong>almost 10× more</strong> than a heated cushion.</li>
    <li>💻 A laptop (50 W) uses <strong>around 8× more</strong>.</li>
    <li>🔥 An infrared heater (2,000 W) uses <strong>over 300× more</strong> per hour.</li>
  </ul>

  <h2>5. Conclusion</h2>
  <p>A power-bank-driven heated seat cushion is one of the <strong>most energy-efficient ways</strong> to stay warm. You get cosy, targeted heat for just a few öre – perfect for the patio, boat and stadium.</p>

  <p><a href="https://dynan.se/products/sittdyna-med-varme"><strong>See Dynan – rechargeable heated seat cushion</strong></a></p>

  <hr>
  <p><small>These calculations are based on averages. Actual runtime and power draw vary with heat level, ambient temperature and the specific power bank model.</small></p>
</article>

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