MEXICOWANDERER wrote:
Top notch companies with similarly top gifted design engineers are the only valid source of information about their product. Concorde says without stuttering, that low charging potential will adversely affect their product.
I'm not sure C&D Technologies ever mentions that in their VRLA technical papers. I've read a lot of these papers, but haven't yet been able to find anywhere where C&D mentions negatives for lower voltages being used for recharging of their AGM batteries similar to what Concorde maintains. In fact C&D shows charging curves using various voltages, including 13.8 volts.
Their "VRLA Batteries" section in the lower half of this page lists a lot of literature related to AGM:
http://www.cdtechno.com/resource/support_doc.html