Low Battery Warning (or lack of)

To my knowledge, and unfortunately, the base station only announces a low battery warning ONCE.  If you're not there to hear it, you won't know about it, but you could also check your keypad for the same message (I can't remember if the message appears in the keypad or not, I don't ever remember seeing it).  So, when you do get those sensor errors "not responding", it could be low or dead batteries, but it could also be something else, like a weak cellular signal, or too far away from the base station, or sometimes, they are defective and need to be replaced.  I would suggest keeping a log of when you change batteries in all of your sensors and make a habit of replacing them before you expect them to die.

It appears on keypad. Had it there for my glass sensor

Thanks, Dandy, I never remembered seeing it before, so good to know!

Lew, it won't show on the timeline of events, only the type of "error" (aka, "not responding", or sensor "offline", or something).

I too wish it would give an earlier warning, or at the very least, repeat base station announcements.  But if it helps, when you get those errors, the first thing to check is dead battery anyway, lol.  Fair warning, sometimes those warnings will come at 3 am or sometime in the wee hours of the morning when you're sleeping, so unless you check your keypad display or log in to your dashboard, you won't know the battery is dead, or, "not responding". (btw, if you get text alerts, you'll also get them for sensor errors). Just make a mental note/habit to check your keypad display every day.