In researching Elxir converters I can only turn up this one page flyer http://elixirind.com/image/data/medi...Converters.pdf
which leads me to believe that this is a simple single stage converter. The remainder of the Elixir website yields nothing.
If this is a freestanding deck mount unit, you would be best to replace it with a multistage converter such as the Progressive Dynamics 9100 series. If you have an Elixer power center Best Converter recommends different replacement units depending on what model Elixer power center you have. https://www.bestconverter.com/Elixir...rter_c_76.html
Apparently Elixer no longer manufactures converters (if they are in business at all)
In any case you want a good multi-stage converter that will bulk charge a low battery at a higher voltage (about 14.6) and then drop down to about 13.6 to top off and then drop to 13.2 for maintenance and storage of the battery. This will not heat or cook or boil off the battery.
I prefer the Progressive Dynamics units if at all possible since they are designed and manufactured in the USA.