G'Day Rick I got a price guide from Kedron and about the same time received an Email from Caravan World that has an excellent article published this month. I am currently spending a lot of time brousing to see what is available in the way of types of batteries, costs and their specs. The latest of interest is Victron batteries where they have 12v Gel batteries with a design life of 12 years. A price of them when I get one may be interesting. Yes I agree with you regarding longevity of Lithium batteries and it is very difficult to justify the costs involved particularly when converting a system. Cheers John