This is in the boot/trunk of an Audi A4 2.0 TDI B8 Turbo Diesel. I've no idea what it is, the car is for sale but there is no mention of what
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![Audi A4 B8 - Charging The Battery - from the boot [Ctek MXS 7.0] - YouTube](https://i.ytimg.com/vi/MOL8v3X2Av4/hqdefault.jpg "Audi A4 B8 - Charging The Battery - from the boot [Ctek MXS 7.0] - YouTube")
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