I don't believe I have flattened it, however when on the CSR the Engel wasn't lasting overnight which I expected it to do so, so I left it off overnight.
I had the battery checked a couple of months ago and the water had dropped below what it should have, the battery was only around 5 months old at that stage. The reason I had it checked was that there was a message on the D3 radio screen most mornings "Battery Low" and I did a check on the voltage which showed around 11. something volts. That message has now returned, perhaps as Pedro says I have a dud.

