On Nov 27, 2022, at 8:21 PM, Simon Wilson via Nut-upsuser wrote:
> 
> "[replbatt] The UPS needs to have its battery replaced. Not all UPS's can 
> indicate this."
> 
> Can anyone advise whether the Eaton USB UPSs support that? Specifically mine 
> is a 5SX 1750.

I don't know for the 5SX line in particular, but if you have a maintenance 
window where you can stop NUT, then start the usbhid-ups driver manually with a 
few -D flags (was 2+ for older versions of NUT), there is a HID descriptor 
element you can look for:

UPS.PowerSummary.PresentStatus.NeedReplacement

and that gets mapped to the RB flag in ups.status, and "Replace battery!" in 
ups.alarm.

If the 5SX is a superset of the 5S, then it should have this. A 5S 1000 log is 
here: https://alioth-lists.debian.net/pipermail/nut-upsuser/2016-May/010122.html

Reference:

https://github.com/networkupstools/nut/blob/v2.8.0/drivers/mge-hid.c#L1264 
(assuming your UPS has a vendorid of 0x0463) maps the variable to 
replacebatt_info -> mapped to "replacebatt" string in drivers/usbhid-ups.c, 
then to RB: 
https://github.com/networkupstools/nut/blob/v2.8.0/drivers/usbhid-ups.c#L1681-L1683

-- 
clepple@gmail
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