Bin the anti-rust thing for a start! Put it in the cupboard with your Brockie crystals.
I’m with Tombie. That’s ridiculous length of time for idle time battery life. You need to go through it and find what the drain is.
I recently bought an ammeter that had inductive capability so I can simply clip it over a wire and see the current, rather than needing to get in-line with it. Much easier to test current flow (just remember if you do this you can only do the positive or negative - not both wires else the positive flow is cancelled by the negative).
Go around the devices one by one and check their idle usage. Anything over 30ma is problematic and with so many thing, that’s potentially even at 30ma per device, a lot of parasitic current draw.
Finally there is a cut off relay that fails that causes excessive drain. Have you checked the ECU codes recently for a fault? That relay failing is logged IIRC.
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
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