I never had any luck... They look like they have made a couple of times but when I started my long periods of pulling 20AMPS continuous at 6PM settling in for the evening they always seem to go out on me around 10PM at night.
A long slow charge starting with 14.4VDC for a couple or three days is the way I always try to bring them back...
Sounds like 13.6VDC eat up some more batteries to me... When I finally bit the bullet and replaced out my new WFCO WF-8945 Converter/charger for the PD9260C converter/charger I haven't boiled out any fluids since then. This was in 2009... You can bet I still do my bi-weekly fluid checks on them when on long charge times sitting here at the house haha... Then ther batteries are expensive to not keep your checks going...
Roy Ken