Jump-starting a car – step-by-step instructions with cable and power bank

Jump-starting a car – step-by-step instructions with cable and power bank

Kfz-Sachverständigenbüro Alkan January 24, 2026 6 min read

Winter poses a particular challenge for drivers, especially when the vehicle's battery gives up the ghost during the cold months. However, with the right technique, you can safely jump-start your car using jumper cables or a power bank. In this guide, we'll show you how to get your car running again quickly and safely.

1. Jump-Starting with Jumper Cables – Step by Step

What you'll need:

  • A good set of jumper cables
  • A functioning vehicle with a working battery

Step-by-Step Instructions:

1. Ensure both vehicles are turned off and the handbrake is engaged.
Make sure the batteries are in good condition and show no visible damage. Cracks or wear can lead to a short circuit.

2. Connect the red cable (positive) to the positive terminal (+) of the recipient vehicle's battery.
The other end of the red cable should connect to the positive terminal (+) of the donor vehicle's battery.

3. Connect the black cable (negative) to a metal part of the recipient vehicle's chassis.
The other end of the black cable should be attached to a metal point on the donor vehicle (e.g., a bare section of the engine block). Avoid touching the battery terminals or sensitive electronics.

4. Start the donor vehicle and let it run for a few minutes to charge the recipient vehicle's battery.
Check regularly to ensure the recipient vehicle's battery is receiving enough charge to start the engine.

5. Try starting the recipient vehicle.
If it doesn't start immediately, wait a few minutes and try again.

6. Disconnect the cables, starting with the black cable from the recipient vehicle.

7. Drive for at least 20-30 minutes to fully recharge the recipient vehicle's battery.

2. Jump-Starting with a Power Bank – Step by Step

What you'll need:

  • A powerful power bank with jump-starting function (12V jump-start pack). Ensure the power bank is suitable for your vehicle’s engine size.

Step-by-Step Instructions:

1. Make sure the power bank is fully charged and has enough power to start the vehicle.
Many power banks come with a 12V output, ideal for jump-starting car batteries.

2. Connect the black cable (negative) to a metal, unpainted part of the vehicle (e.g., the hood), not directly to the battery. This is safer and prevents sparks and damage to electronics.

3. Turn off all unnecessary vehicle consumers (lights, heating, radio, etc.).

4. Turn on the power bank and try starting the vehicle.
If it doesn’t start after a few minutes, turn off the power bank and try again.

5. Drive for at least 20-30 minutes to ensure the recipient vehicle’s battery is sufficiently charged.

Conclusion

Being able to jump-start your car during the winter is a useful and simple skill that can save you a lot of time and hassle in an emergency. With a jumper cable or a power bank, you can quickly get your car back on the road and continue your journey. Always ensure you're working safely and connecting the cables properly to avoid damaging your vehicle. This way, you'll be well-prepared for the cold winter months!

The variety of power banks available on the market can make choosing the right one difficult. At KFZ Gutachter Alkan, we’ve thoroughly examined various models to bring you the best options.

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