Step-by-Step: Replace & Code the 12V Battery in a Volkswagen ID.4, by 🤍 VWIDTalk and Speak EV on YouTube. 19 min 35 s.
- Video length
- 19 min 35 s
- Time to do it
- 1 hour
- Difficulty
- Medium
- Steps
- 9
What you need
Steps
Park on level ground, switch off the car and keep the key fob well away from the vehicle. Let the car sit so the high-voltage system powers down.
Open the bonnet and remove the plastic covers over the battery area. Undo the strut bar with the 14mm socket so you can reach the battery.
Follow the de-energizing procedure for the ID.4 before touching the terminals. This step differs from a petrol car, so do not skip it.
Disconnect the negative terminal first with the 10mm socket, then the positive terminal. Unbolt the battery clamp and lift the old battery out.
Lower the new H4 AGM battery into the tray, refit the clamp and reconnect the positive terminal, then the negative. Tighten the terminals to 5 Nm.
Refit the strut bar and tighten its bolts to 20 Nm. Replace the plastic covers.
Connect OBDeleven or VCDS and open Module 19 (Gateway). Go to battery adaptation and enter the new battery details.
Set the battery type to Fleece for the AGM battery. Do not leave it on the EFB setting, or the car will not charge it correctly.
Run the basic settings for the steering angle and the windows so those systems relearn their positions. Clear any fault codes when done.
Tips and common mistakes
Always disconnect the negative terminal first and reconnect it last to avoid short circuits.
Use an AGM battery and select Fleece in the coding, since the factory EFB setting will undercharge it.
Torque the strut bar bolts to 20 Nm and the battery terminals to 5 Nm, not just tight by feel.
Wear safety glasses, since a lead-acid battery can vent gas and acid if handled roughly.
Questions
Do I really need to code a new 12V battery?
Yes. The ID.4 needs to know the battery type and capacity so it charges it correctly. Skipping the coding can shorten the new battery's life.
Can I use a normal lead-acid battery instead of AGM?
An H4 AGM is the safer choice and matches the Fleece setting. A standard battery may not cope with the car's charging profile.
Why is the de-energizing step needed?
The ID.4 has a high-voltage system, and the 12V battery controls its contactors. Follow the proper shutdown procedure before working near the battery.
This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.
