Benz... I'm not totally sure but my best guess (relating to the mk3 alkaline devices) is this....
I think the devices are pre-programmed to send out there battery status maybe every 24 hours. There is no timer involved in the panel whatsoever.... the panel does not display any battery information or percentage of battery left until the panel sees a low battery signal from a device.
It's EMS who said there is timer for batteries the one giving the left batteries percentage through 'device data base'..., and as usual they drop very thin droplette of info each time I call them to seeking advise, they don't want to give more details, my last interpretation in the previous post was based on the role of the microprocessor in general combined with, what I received from EMS...etc
I hope one day I can get in touch with them, to discuss things in details... but I am pretty sure they don't want like any manufacturer, to give further secrets of how the system is designed to operate... etc