Another quick update, the battery tester came quite early this morning (gotta love Amazon) and immediately I wanted to see what was going on. Wanted to be as concise as possible, so pulled the battery again and put the tester on. Weirdly enough, the screen just flickered on and off. I reseated the clamps and got it into a position where the screen stayed on and it could 'start up' I suppose you'd call it.

Immediately though, "Er3" which according to the book means "This symbol indicates the tester is abnormal or the battery capacity is beyond the test range." Now, that last part is what threw me off as it's a tester for 12V lead acid batteries, and it has a test range of 5-20V so that would tell me that it's likely below the 5V threshold. But then it makes me curious as to how my charger again immediately told me the battery is fully charged.

I'm waiting for a friend to come over and I'll be using the charger and the tester on a known working battery, just to rule out a failure with them (very unlikely, but you have no idea h ow unlucky I am). Assuming they work, I will likely have to get a new battery but that scares me as there were no signs of degradation on the current battery. It's an Exide EB602 that came with the car but doesn't look too old.

Considering I was getting the strange door open beep on Saturday evening after an uneventful 2 hour, 77 mile drive, I don't want to spend £80/90 on a new battery only to have a fault kill it within a day again.

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