All batterys discharge even without a load. Some faster than others. One of the great traits of AGMs is the very slow rate of discharge in storage.
I am a firm believer in AGMs. Bought mine, a single 4D case rather than 2 group 27s or 31s. During winter storage I do not have the luxury of even seeing my trailer for over a six month stretch. During that time the battery is disconnected. The battery has served well since 2009. After each storage period the battery has recharged in less than an hour after 6 months storage.
This year, we shall see. The battery has been unattended since early last November. It won't get plugged in again till early July. It is now 8 years old. Even at this age & 8 months untouched storage I don't anticipate a problem when I connect it July 6th.