battery discharging on st 16

Winter months here in Kansas mean my Typhoon H Plus is going to need to have it's batteries charged in "storage" mode. I'm new to the Yuneec DY5 Battery Charger I just purchased and received. It seems simple enough but I have a couple of questions about the "Storage" function. How long do I let...

It's pretty well been established that the batteries in the typhoon H should be stored discharged. Does the same apply to the st16 controller battery ? in other words should it be stored at a certain voltage level if you're not going to use it for 3 weeks or longer