Please report this to Spook as this is in the official HA documentation click here and it works.
Let us know how you go.
Blacky 
1 Like
Stay Charged, Stay Smart! Customize it your way and letās automate your battery maintenance! 
Bugs Fixes 
- Fixed bug when using Tuya, some other brands etc batteries that report low, some would not be shown.
hope I have got them now as I donāt use Tuya and cant test it so if someone can confirm that would be helpful.
If you like this blueprint? Consider hitting the 
button in the top post 
If you like my blueprints, and would like to show your support or just say thank you? Click Here 
Enjoy
Blacky 
I canāt get Alexa to say the names of the batteries that need replacing.
service: notify.alexa_media_animeking_echo_dot
data:
title: Low Battery Notification
message: >-
{{sensors_names}} all have a low battery level and it is time to replace
them
I donāt have Alexa but try this. Make sure you have some to report. Maybe also use the easy notify for testing with custom actions.
service: notify.alexa_media_animeking_echo_dot
data:
title: Low Battery Notification
message: "{{sensors_names}} all have a low battery level and it is time to replace them"
or
service: notify.alexa_media_animeking_echo_dot
data:
title: Low Battery Notification
message: >
{{sensors_names}} all have a low battery level and it is time to replace
them
Let us know how you go and what one worked if any.
Blacky
Hiya. Have been using this a few days and was working great. I noticed yesterday and today it shows āunavailableā for my 5 smoke detectors (whos batteries I just replaced a few days ago). As you can see when I go thru devices it shows 95 or 100% battery. Unsure why this would come back unavailable. Any suggestions where to start? Thanks
Have a look at the history of those batteries. They may of been unavailable at the time it was checked. HA check it and if they are unavailable then it report it so it would be more than likely they were unavailable. You could also try testing it when looking at the UI. Sometimes these type of sensor donāt report all the time to save battery, you can also get the reporting intervals in the history.
Blacky
Thanks for the reply. This is what one looks like, shows 100% across the board. One thing Im noticing, and not sure this may be normal, but when i mouse over the graph I only get a handful of interaction points with specific date/time/value, although the graph shows 100% the entire time. For example this 4 day graph has 6 available times I can mouse over the line to get specifics (although in all 6 cases it does show 100%)
I found the logbook and here is what is shows. I do see where it was unavailable on 3 occasions, however none of these were at 8am when I have the automation run.
It can be a bit tricky with these types of batteries. The goal is to save battery life. HA is saying it is 100% but it will be unavailable then a quick update to HA then unavailable etc. See when the automation runs it is what it isā¦ it doesnāt think or make a decision it just reports what it sees at the time. The good thing is you can select the option to disregard these batteries or opt to not report unavailable or just keep it like this. You now know your system and can react as required.
Blacky
Thanks I appreciate the reply. Perhaps I need to look to an automation that, instead of giving me a daily āpollā it can sense when it changes (my guess is smoke detectors dont come āonline muchā, and then shoot an intstant notification at that time. I will look around for that. I suppose if youve done something similar let me know. I mention only because I see you have a wealth of blueprints heh. Thanks!
Mose of these types of batteries donāt go flat over night. I would just set up a reminder to check the battery every X amount of time. Once you get to know your smoke detectors then you will be able to fine tune your reminders. If you do it on a state change you could get it at night when you are sleeping. This is why I donāt have state change.
Blacky
Just started using HA and came across your blueprint. Very nice! I am having trouble sending a notification. I select my device ,but it does not go through for some reason. I can set up a generic automation to send me a notification on an open/close routine, it goes to my phone and ipad. Like I said I am very new to this HA. What could I be missing?
Welcome to the community
Make sure you have enabled the notification option, see below. You can choose from 2 enabled options and then you can select what you would like to receive.
Hope this helps you.
Blacky
Thank you. I looked over this blueprint numerous times. This wasnāt there before was it, you made an update right . 
Just like looking for something in the pantry and the wife says itās right here! Ha Ha. Thanks again.
It happens to the best of us. Thanks for letting us know and I am glad you are up and running.
Blacky
is there a way to get an āenterā (\n) after each sensor state? Idealy i want a bullet point list.
Yep sure isā¦ see the FAQā¦ number 8. There are also more examples for you. Make sure your between the āā, example below.
message: "Folgenden...{{'\n'}}ā¢ {{sensors|replace(', ', '\nā¢ ')}}"
Blacky
shame on meā¦
Thank you Blacky!
No problem, happy to help.
Blacky
@Blacky can you add support for notify.persistent_notification service so we get a system notification in Home Assistant UI ?