A:AnswerI don't believe there is just looking at the unit. IF one of those leds blinks for this purpose I've never seen it.
However, if you have it connected to your Ring security system you can check the status (and battery level) in the app. The only problem with this is that it may take a long time for the Ring system to notice an alarm that has gone offline.
Of course there is always the "set it off" test - I've not done this on purpose but have had the alarm go off due to a fog machine being used in kids room.
A:AnswerHi, the user manual has a diagram that shows how to replace the batteries, please see link below.
https://digitalassets.resideo.com/damroot/Original/1/M08-0456-169793_D132.pdf
A:AnswerThank you for your question. A Z-Wave hub is required to get the most out of the communication features of the Z-Wave detector. If you need further assistance, please don’t hesitate to reach out to our Support Team at First Alert at 1 (800)-323-9005. We look forward to hearing from you.