From a Magnum charger site:
03C Battery Type. You can choose from Gel, Flooded, AGM1 for Lifeline AGM batteries, AGM2 for most other brands of AGM, CC/CV for Lithium, or Custom to set the voltages recommended to you by your battery manufacturer.
Here are the charge profiles from MK Battery (the mfg. of yours):
https://www.mkbattery.com/applicatio...l_Brochure.pdf