[Nut-upsuser] RFC - new proposed variables and clarifications for the battery collection in NUT namespace

[Arnaud Quette]

Hi there,

as discussed on the below Github PRs, I've recently proposed some
additional variables to deal with battery information in general, and some
Li-Ion specifics:

* PR https://github.com/networkupstools/nut/pull/1060/files
** Add "battery.packs.external": Number of external battery packs

* PR https://github.com/networkupstools/nut/pull/1062/files
** Add "battery.voltage.cell.max": Maximum battery voltage seen of the
Li-ion cell (V)
** Add "battery.voltage.cell.min": Minimum battery voltage seen of the
Li-ion cell (V)
** Add "battery.capacity.nominal": Nominal battery capacity (Ah)
** Add "battery.status": Health status of the battery (opaque string)
** Add "battery.temperature.cell.max": Maximum battery temperature seen of
the Li-ion cell (degrees C)
** Add "battery.temperature.cell.min": Minimum battery temperature seen of
the Li-ion cell (degrees C)

* PR https://github.com/networkupstools/nut/pull/1063/files
** Clarify "battery.date": Battery installation or last change date (opaque
string)
** Add "battery.date.maintenance": Battery next change or maintenance date
(opaque string)

As usual with RFC for new variables, feedback and comments are warmly
welcome.

Thanks and cheers
Arno
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