Please note - I am not a mechanic or expert in anything.
I note from the Manual for the charger that it is designed for up to 60Ah, your battery is rated at 69Ah so using the formula in the manual if the battery is fully discharged it will take 34.5 hours (at 2-amps) to get it to 80% charge (about 12.4-12.5v). In maintenance mode at a maximum of 1-amp the time doubles. These times will be increased if the battery is connected to the car and has a constant drain on it.
The charger does not seem to have a recondition mode so once you have the battery as fully charged as you can from the charger it would possibly help to use the car to cycle the battery's discharge and charge, from the alternator, as the battery is designed for. Use the least consumers and battery consumption as you can until you put the battery on the charger again, to fully recharge the battery again to hopefully have regained as much of the battery capacity as you can. If required you could repeat use of the battery on the car and then another full recharge using the battery charger.
The maintenance mode is really for when the car is not used for long periods, as noted in the car's Owner's Manual but the battery is designed for cycling so should have some discharge.
Winter mode is for when the ambient temperature is below (+)5c, if the temperature was above 5c last time of charging I would not worry about it given the state of your battery.
Manual.pdf
My terminology will not be correct - but - the idea is just to fully deplete the electrics so that you get a reset of the computers, to have a clean start when you reconnect the charged battery, it might not do much, or nothing, but as I put before when the battery gets in a low state of charge it can cause all sorts of unexpected computer or program issues so best to have them cleared if possible and speed up getting back to normal operation.
Thanks. Now if you add that to the information with your site name it will show at each post you make (when viewed on an appropriate device(?)) as example. -