Richard, many thanks for providing your acknowledged superior knowledge on matters electrical and much else from which I have learned a lot.
I guess my attempt was to reply to Rob`s thinking on the charge requirements of an AGM and it`s differences to that of old style lead acid batteries, for an AGM to operate efficiently.
I was quoted circa £500 to replace my 10 year old AGM battery thus I suspect any Morgan running an old style lead acid would have to investigate carefully as to the possible advantages or disadvantages which might exist, when thinking of replacing an old style lead acid battery with a similar capacity AGM battery.
I suspect if attached to an old style electrical system an AGM may not reach a fully charged state, whether that might affect it`s performance long term connected to such a system, I have no idea.
As for longevity, given my AGM would seem to be original to the car from it`s date stamp, and has lasted 10 years and circa 42k miles over that time, seems to indicate it may have spent most of it`s life in a situation of irregular use, and which might also seem to suggest that perhaps an AGM may well operate well enough in a seldom used Morgan.... again I have no idea...
However as to whether in those 10 years my AGM may have run flat or whether it lived much of the time on a float charger of some sort would seem to be anybody`s guess..?
