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Replacing the battery correctly without losing the radio code. It’s this easy!

Follow the instructions below and of course, always the manual provided by the vehicle manufacturer. Then you’ll be able to “do it yourself” and replace your battery without losing the radio code.

These instructions apply for vehicles with and without battery energy management (BEM) or with and without start-stop function if the new battery does not need to be registered.

If your car has battery energy management (BEM) or start-stop function recommending or requiring registration of the new battery, then read on.

How-to: Correctly registering start-stop batteries.

What should I pay attention to when changing start-stop batteries?

To protect against theft, some vehicle manufacturers deactivate the radio in the event of a power failure until a special security code has been entered. Many people don’t know what this security code is or how to enter it. Banner is here to help – with everything you need to know about battery replacement without interrupting the power supply of your vehicle and losing the radio code.

Pro tip on the tools and materials you need:

  1. Open-end or ring spanner – usually 8, 10, 12 and 13 mm are suitable.
  2. Ratchet with extension and sockets – usually 8, 10, 12 and 13 mm are suitable.
  3. Memory Saver for external voltage retention via the OBD plug (on-board diagnostics).
  4. Don’t forget safety goggles and gloves (anti-static or ESD).
  5. Terminal protection spray or terminal grease - for the protection of battery clamps. Prevents the formation of corrosion and transfer resistance.

If you don’t have these at hand, please do not try to do it yourself. In this case, it’s better to have this done 

by a Banner sales partner.


Safety tip: Avoid short circuits caused by tools!

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Banner HOW TO: Changing the car battery – here’s how to do it

Changing the car battery – here’s how to do it!

  • Locate your battery

    Open the bonnet and find the battery. In many cases, the battery will be a plastic compartment or inside padded thermal protection.

    Please note that in some cases, the battery may also be installed in the boot or passenger compartment. This information can often be found in the vehicle’s manual.

    However, this does not affect the procedure for changing the battery.

  • External voltage retention

    To save all vehicle settings and data, connect the voltage retainer (e.g. Memory Saver) to the OBD connector. Furthermore, this procedure saves the subsequent deletion of the entry "Voltage interruption" in the error memory.

  • Changing the battery

    It is essential to observe the warning information on the battery and the operating instructions of the vehicle!

    Only install a battery with an off-load voltage of >12.5V.

    Before installing and removing the battery, switch off the engine and all power consumers. Remove the ignition key; do not leave it in the ignition switch. Do not leave the radio key in the car.

    Avoid short circuits caused by tools.

    Change the battery in the vehicle.

    When removing the battery, first disconnect the negative terminal (-), then the positive terminal (+).

    Now check how the battery being replaced is mounted. With many European car manufacturers, a baseboard bracket can often be found underneath the battery. In other cases, usually with Japanese and South Korean car manufacturers, there is a bracket mounting on top of the battery. 

  • Changing the battery – Part 2

    After you have found out how the battery is mounted, you can start with removing the battery. If the baseboard bracket is underneath, you will usually need a ratchet with extension and socket. If a bracket mounting is on top, an open-end or ring wrench is usually enough.

    Before installing the new battery, clean the mounting space in the vehicle.

    Secure the new battery firmly in place.

    Clean battery terminals and post clamps and lubricate them with acid-free grease.

    For installation, proceed in reverse order, i.e. first connect the positive terminal (+) and then the negative terminal (-). Ensure that the terminals are firmly attached.

    Original attachments/coverings must be refitted.

  • Remove external voltage retention.

    After the battery has been replaced, the Memory Saver can be removed.

  • Step 5 – Test start

    Now, start the engine to ensure that the new battery has been installed and connected correctly. “VROOOM” – is usually a good sign. Now switch on the car radio. Perfect, the radio code is present and full sound is guaranteed.


    Please note: For vehicles with “Keyless Go & Entry” systems, it is important to ensure that many control units in the vehicle are ready when the keycard or key is close to the vehicle!

    Banner tip: For safety reasons, always use a degassing tubewhen installing the battery in the interior, as this will discharge the gases to the outside.  

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The Banner buffalo wishes you a pleasant onward journey and always a safe start.


PS: We hope that you’ve been able to follow these instructions without any issues. If you have any questions, please contact your Banner customer service representative, your Banner sales partner or contact us directly online.