I looked at the charger you listed. It is automatic for wet, AGM, and gel batteries. My first thought was my charger would charge like that but it is manual selection.
I put the charger on normal setting and it put out 15.9v. I changed it to AGM and tried again and it charged 15.3 volts. I tried a third time and set it to gel and it charged 14.6 volts. I will try a charge on the gel setting and keep a close watch on it. Thanks for your comments.