Yes, that seems promising with regard to the battery.

Reconnect to car and continue to monitor, I think. 

You will see lower numbers*, but hopefully only slightly, and the rate of drop may tell you something about the level of parasitic drain without any active measuring of currents.

 

*Because the current when connected is never zero, even if all 'fault' parasitic currents are eliminated.

10 minutes ago, Wino said:

Yes, that seems promising with regard to the battery.

Reconnect to car and continue to monitor, I think. 

You will see lower numbers*, but hopefully only slightly, and the rate of drop may tell you something about the level of parasitic drain without any active measuring of currents.

 

*Because the current when connected is never zero, even if all 'fault' parasitic currents are eliminated.

Will do. Thanks again

Interim results:

 

2 Feb: 9.30 battery connected

2 Feb: 11.30 (9.4 deg C), 12.62v

2 Feb: 13.30 (9.8 deg C), 12.78v

3 Feb: 9.30 (8.7 deg C), 12.63v

3 Feb: 11.30 (9.4 deg C), 12.63v

4 Feb: 9.30 (8.8 deg C), 12.61v

4 Feb: 11.30 (9.6 deg C), 12.59v

4 Feb: 13.30 (10.9 deg C), 12.6v

5 Feb: 9.00 (8.3 deg C), 12.55v

 

Up until this morning I thought it was looking pretty good in that the battery was holding its charge very well. I was hoping that the whole thing might have been a red herring (battery ran right down during last Spring's lockdown and maybe I never really fully recharged it using the battery charger). However, the drop to 12.55v might be an indication of "things to come". I assume its best that I continue monitoring for a few more days and see what happens?

Looking good?

6 Feb: 9.30 (6.7 deg), 12.53v

6 Feb: 13.30 (7 deg C), 12.50v

7 Feb: 9.00 (4.9 deg C), 12.47v

7 Feb: 11.30 (5.5 deg C), 12.47v

7 Feb: 15.30 (4.8 deg C), 12.47v

8 Feb: 9.00 (3.3 deg C), 12.44v

8 Feb: 11.00 (3.9 deg C), 12.44v

9 Feb: 9.00 (1.8 deg C), 12.42v

9 Feb: 11.30 (2.9 deg C), 12.41v

10 Feb: 9.00 (1.8 deg C), 12.39v

10 Feb: 11.30 (3.6 deg C), 12.39v

11 Feb: 10.00 (1.8 deg C), 12.37v

 

In total, the battery has lost 0.25v over 9 days. 

 

That looks quite acceptable to me (but i know nothing about these things). If so, I'm beginning to think that the whole thing was a false alarm. No battery problem, no parasitic battery drain (just the normal from running basic required functions) and that the issue was entirely due to the fact that a run down battery (because of sitting around doing nothing because of covid) was never properly charged up by me?

I tend to agree. 

8 minutes ago, Wino said:

I tend to agree. 

Wino - can't thank you enough for all your help. I would have struggled alone, so your knowledge and expertise has been a real godsend. I'm sure I'm not alone in having been helped on here by you. Over and.......hopefully....out!