Yes - this seems odd.
However, there is definitely something, somewhere, in these cars that stores electricity, apart from the battery itself.
I had a flat battery; disconnected a terminal to charge it, whereupon the alarm sounded for some time. Something was powering the alarm. (I imagine this is to stop would-be thieves from disabling the alarm.)
I know next to nothing about car electrics - maybe someone else can shed some light. But it occurs to me that this might be connected (!) to your problem with a parasitic draw.
P.S. Having seen Elekie's post, I should point out that I'm talking about an 05 plate Focus.
Edited by FP on 22/06/2018 at 14:18
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