service battery in the trunk

Hello everyone, I am looking for precise information and advice on locating the service battery (auxiliary 12V battery) in the trunk of my Peugeot 3008 Hybrid4 model 2021. I have already changed the 12V battery under the engine hood, but what interests me particularly is the second service battery which is located in the rear trunk. I opened the removable floor of the trunk but I did not find a clear video or photo which shows the exact location of this battery in the trunk, nor how to dismantle it or reach it easily. If anyone has already done this manipulation or has guides, photos, videos or advice for accessing this utility battery in the trunk, I would be very grateful. Thank you in advance for your help!