Re: Wait, the door doesn't re-lock until it's instructed to?
And anyone who actually knows what they are talking about will tell you that the average system has a 2Ah battery
It's you who doesn't know what they are talking about; the most common SLA battery used for burglar/fire alarms is 7Ah. So you're looking at several days before the battery is exhausted, and usually they'll signal in some way that the battery is running low.