What can I expect for a self-discharge rate of your lithium-manganese dioxide batteries? Is the self-discharge mechanism in play when when the battery is in use?

RAYOVAC®'s 9-volt lithium batteries are warranted for 10 years of operation only in Ionization-type smoke alarms. Commercial alarms, such as the 8520, are Photoelectric, which operate with a significantly higher current drain, and we do not provide a minimum battery life warranty for those types of alarms. The expected battery life in the AT&T 8520 alarm ranges from 18 to 24 months, as compared to 12 months or less with alkaline batteries.