2014/2015 Outback Terrain 250TRS Converter

Does anyone know if the converter in the Terrains has a 3 stage charger? I have a 250TRS on order and am curious as our existing HTT has 3 stage and I am still using the original two 12volt batteries from 2005. I leave the HTT plugged in at all times except winter storage and I charge the batts every month in the garage in the winter. Keep the water filled and batteries are still good to go!