You are looking this wrong. Bringing down the level of the battery just shortens its lifespan. Sulfation isn't much of an issue unless the battery is left sitting at partial charge for long periods, which you are effectively reducing by using the float maintenance charger during off season storage.
You also don't really need a battery maintainer with temperature compensation. If it's a built in *free* feature, sure why not have it but you can just use a float charge level that ends up very low mA at the float charge voltage so you aren't cooking off electrolyte. Temperature compensation is far more important for faster charge rates.
Unless the charger/maintainer is defective towards its purpose, all you need to do is hook it up when you are about to leave the battery stored/unused then disconnect it for periods where there are not long periods between normal recharge events. I suppose if you want to go the extra effort, you could use a normal faster charger to get it near 100% before hooking the float charger up, but these aren't huge batteries so the amount of time at relative charge level isn't that long for a little float charger.
Last edited by Dave9; 01/17/20 06:41 PM.