You can always rely on your Banner battery if it has been well maintained. But suppose your neighbour is struggling to start their car?

We will show you what to look out for when performing a jump start.


Performing a jump start with cables


  • For performing a jump start with starter cables, we recommend the use of standardised starter cables (e.g. according to DIN 72553).
  • Follow the instructions for use for the starter cables.
  • Only connect batteries of the same nominal voltage.
  • Disconnect both vehicle engines before connecting.
  • First connect the two positive terminals 1 (battery from the vehicle in need of assistance) to 2 (battery from the donor vehicle), then connect the negative terminal 3 (battery from the donor vehicle) to the earth terminal on the vehicle in need of assistance 4 (earth = metallic smooth point away from the battery). Observe the instructions of the vehicle manufacturer.
  • Now start the vehicle in need of assistance for max. 15 seconds without starting the donor vehicle.
  • When disconnecting, disconnect the cables in reverse order.


Do not jump-start an electric car!

For technical reasons, the jump-start points of electric cars, if available at all, are not designed to jump-start other vehicles. In this case, it is better to seek the help of a breakdown service. Conversely, however, an internal combustion engine may properly jump-start an electric car.

Our Banner tip: Due to the sensitive electronics in the vehicle, jump-starting should generally only be carried out with a Banner booster. Car-to-car jump leads can cause voltage spikes when disconnected, damaging or even destroying the vehicle's electronics. It is therefore essential to follow the instructions below when using starter cables.

Donor vehicle does not start, why and why not!

The donor vehicle is often started, now let's assume it runs at idle (idle speed) with an alternator output of approx. 50-70%. Now the fatal thing happens: the accelerator is almost always pressed hard to increase the engine speed and the charging voltage, in the mistaken assumption that even more starting power is needed.
Unfortunately, this happens too often: with a bit of luck, only the starter cables burn out (depending on the cable cross-section*), in the worst case, the control units of the vehicle in need of help are damaged - due to overvoltages or voltage peaks. Therefore, please be sure to follow the Banner How-To jump-start instructions.

Another Banner tip: Number of starting attempts max. 3-5, length of each starting attempt max. 15 seconds - otherwise unburnt fuel could get into the catalytic converter of vehicles with catalytic converter, with all the negative side effects.
PS: Let's completely disregard the driving mode in which the assisting vehicle is currently providing jump-starting assistance. There are cars with voltages of up to 15.3V in normal driving or sport mode!


* For copper cables, the cross-section should be at least 16 mm², for aluminium cables at least 25 mm². From 2 litres capacity, a cross-section of at least 25 mm² (aluminium 40 mm²) is advisable for copper cables. For even larger engines (3 litres and more), copper jump leads with a cross-section of 35 mm² (aluminium 55 mm²) should be selected. If no professional jump starter (booster) is available.

The jumper cables should definitely comply with DIN standard 72553 or ISO standard 6722.
Info on cable material: Aluminium cables are not quite as conductive as copper and must therefore be thicker accordingly (as noted above).
Banner tip on cable length: For sufficient room to move and for the cables to be sufficient from encoder to encoder, the cables should be at least 2 metres long, ideally and at most 3 to 4 metres long.
Please note: Extremely long cables are practical if the broken-down vehicle is in an awkward position and the rescue vehicle cannot be placed directly next to it for bridging. However, a thicker cable cross-section is necessary because the electrical resistance increases with the length of the cable!

Video Starthilfe geben mit Power Station
Banner HOW-TO: Getting started correctly with Banner Power Booster PB12 or PB12/24

Getting started correctly with Banner Power Booster PB12 or PB12/24

  • Connect the red clamp to the positive terminal and black clamp to the earth terminal*.

    • This is particularly important in modern vehicles due to the battery sensor, as otherwise the sensor cannot recognise the starting current correctly and may generate an error message.
    • *The recommendation has been made before, that time due to the formation of sparks when coming into contact with the negative terminal. (Earth = metallic smooth point away from the battery).
  • Switch on Banner Power Booster PB12 or PB12/24

    • After connecting the clamps, start the jump starter.
  • Starting the vehicle

    • Now start the vehicle.
    • Number of start attempts max. 3-5, length of start attempts approx. 15 sec. each - otherwise unburnt fuel could get into the catalytic converter of vehicles with catalytic converter, with all the negative side effects!
  • Switching off and disconnecting the Banner Power Booster PB12 or PB12/24

    • After the jump start is successful, switch off the device and remove the clamps.
    • The Banner Power Booster PB12 or PB12/24 can be used in many different ways – e.g. passenger cars, agricultural and construction machinery, off-road vehicles, trucks, commercial vehicles, breakdown service, etc.
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Where is the battery located?

The car battery is not always installed in the engine compartment, but can also be located in the interior/glove compartment or boot.

However, this doesn’t affect the jump start procedure. 

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