The GENIUS1 is a 6-volt and 12-volt battery charger, battery maintainer, and battery desulfator rated at 1-amp for lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries.
I haven't written up a general tips doc yet. However, the battery charger user guide is in the large House Manuals binder, or you can see it online here. Also, the NOCO webpage for the charger is here
If you're looking to charge a normal 12V battery, then the Tips - Charging Riding Mower Battery walks you through that process for the riding mower.