battery percent does not persist when battery device goes to sleep

[magiva]

Checklist

• I have restarted Home Assistant after the HACS or manual install.
• I have read the FAQ's.
• I have enabled debug logging for my installation.
• I have filled out the issue template to the best of my ability.
• This issue only contains 1 issue (if you have multiple issues, open one issue for each issue).
• This issue is not a duplicate issue of any previous issues..

Battery Notes Version

battery percent doesnt persist when the device sleeps and goes unavailable

Describe the issue

battery percent doesnt persist when the device sleeps and goes unavailable.

i have a number of smoke alarms, i cant use battery+ for automation when the level drops as they only report every 3 hours, the battery+ goes unavailable, it should retain the last value.

i end up having to create secondary sensors to account for this, the battery+ should really handle this i feel

Reproduction steps

1. use a battery device that sleeps
2. observe battery+ percent
3. observe value disapears as the device goes unavilable
   ...

System Health details

i dont have this

Debug logs

Diagnostics dump

No response

[andrew-codechimp]

Hi, couple of questions as I don't have any sleepy devices.
Does the original battery also go unavailable for the duration of the sleep?
Does Battery+ update its value when the device wakes?

[magiva]

this is what i see in battery+

it wakes up to post its battery every 3 hours or so. other battery devices do the same but with different intervals.
a motion sensor for example sends its battery with a trigger or just periodically wakes
but then all go to sleep as battery devices should.
the picture does show the percent value but thats because the device hasnt gone unavailable yet but you can see in the chart that that is what happens

[magiva]

here is the smoke alarm (2) that has gone to sleep so the sensor shows no value

[andrew-codechimp]

Thanks, so just to confirm the original battery sensor is doing the same, going unavailable then back to a percentage?

[magiva]

Yes exactly

…

On Sat, 29 Aug 2026, 13:40 Andrew Jackson, ***@***.***> wrote: *andrew-codechimp* left a comment (andrew-codechimp/HA-Battery-Notes#5077) <#5077 (comment)> Thanks, so just to confirm the original battery sensor is doing the same, going unavailable then back to a percentage? — Reply to this email directly, view it on GitHub <#5077?email_source=notifications&email_token=ABZMQZIOHTCOS2BDODVKJB35MK6LBA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBWGIYTSMJYGMZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5462191833>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABZMQZP7PNFJNENGDJFXL6D5MK6LBAVCNFSNUABFKJSXA33TNF2G64TZHM3DOOJXGEZTIOJVHNEXG43VMU5TKMRYGU3DANZRGYZ2C5QC> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/ABZMQZPZXJMKFTUFIQ4F5LD5MK6LBA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBWGIYTSMJYGMZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/ABZMQZJQO7UWEDHN3K4J2T35MK6LBA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBWGIYTSMJYGMZ2M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[andrew-codechimp]

Thanks, I'll give this some thought but I'm currently leaning towards an option per device to retain value that you can switch on for sleepy ones.
That way those that rely on unavailable states can still use it for general devices.

[magiva]

Sounds good to me and fits how others may already have configured their systems.

…

On Sat, 29 Aug 2026, 14:46 Andrew Jackson, ***@***.***> wrote: *andrew-codechimp* left a comment (andrew-codechimp/HA-Battery-Notes#5077) <#5077 (comment)> Thanks, I'll give this some thought but I'm currently leaning towards an option per device to retain value that you can switch on for sleepy ones. That way those that rely on unavailable states can still use it for general devices. — Reply to this email directly, view it on GitHub <#5077?email_source=notifications&email_token=ABZMQZP23PKSQBMCKZQS2ID5MLGBNA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBWGI2DSMRSHE42M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KYZTPN52GK4S7MNWGSY3L#issuecomment-5462492299>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABZMQZNPQDEB3YFSFDRH2WT5MLGBNAVCNFSNUABFKJSXA33TNF2G64TZHM3DOOJXGEZTIOJVHNEXG43VMU5TKMRYGU3DANZRGYZ2C5QC> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/ABZMQZMICTPNA6USP5V5MGL5MLGBNA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBWGI2DSMRSHE42M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2KUZTPN52GK4S7NFXXG> and Android <https://github.com/notifications/mobile/android/ABZMQZNSKLNHMCS2PEOUDKT5MLGBNA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTKNBWGI2DSMRSHE42M4TFMFZW63VGMF2XI2DPOKSWK5TFNZ2K4ZTPN52GK4S7MFXGI4TPNFSA>. Download it today! You are receiving this because you authored the thread.Message ID: ***@***.***>

[andrew-codechimp]

This has now been implemented in version 3.7.0
An additional option within a device's battery note.