The difference between deep cycle and (Starting, Lighting, Ignition) SLI batteries is primarily the thickness of the plates. Deep cycles batteries have fewer but thicker plates that allow it to give up energy at a sustained rate whereas an SLI in the same Group size will have more plates but they are thinner. SLI is better than a deep cycle for the burst required for starting. All that said if I was choosing one to do both jobs I’d go with the deep cycle since the SLI will fail much faster when used for continuous draw.
Any charger will charge either battery type it is just a matter of time. This all works until you get into the charging requirements for flooded cell verses AGM batteries most chargers on the market chronically undercharge AGM batteries because the finishing voltage is not high enough. Sorry this is getting into the weeds. I’ll post a link to one of the classes I used to give…as soon as I find the link.
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