Get yourself a battery charger that will do a Storage Charge. It'll fix the voltage of each cell correctly for storage. An ammo tin should be fine but I just keep them where I can see them. Watch for bulges.
Same with my Q500+. The controller doesn't retain the date and time, which it should easily get from GPS.
Any clues there too? Sorry for the slight hijack!
I'm finding all my videos from the CGO2+ camera are all dated January 2014. The only place I can find to set a current date and time is on the ST10+, which does not retain the information after switch off.
Ideas anyone?