Jonathan G,
Sorry to hear you also have a failed Exide AGM battery - fortunately failed at home and did not leave you at the roadside!
I have finally managed to make contact with the manufacturer and Exide are now keen to analyse their AGM 12-31 batteries that have failed prematurely.
They are arranging to collect mine which failed after 18 months and have asked if there are others examples available?
Do you still have yours that Exide could collect to continue with their investigations?
Whilst writing if anyone else has an example of an Exide AGM 12-31 prematurely failed battery that they are willing to make available to Exide please post and I will happily coordinate with Exide.
Bob
Good work Bob. Let's hope that their investigations are thorough.