You don't want a GEL charger (which is again, another animal), you want a charger specifically designed to handle AGM batteries. The terms are used interchangably but that is a shame since they are not the same thing.
I have a battery charger that will do all 3 types. Lead Acid, Gel and AGM. Some sense the battery type and will switch automatically to the correct charge cycle. I have to set mine manually.
Hope this helps.
Great info, Ron. 1) is my 2011 RT a gel or AGM? I have never seen it. 2) What brand of charger do you have? I am not aware of one that charges different types other than deep cycle....thanks for the post...