On Sun, 28 Jan 2024 19:19:55 +0100
hw <h...@adminart.net> wrote:

Hello hw,

>How do you know in advance when the battery will have failed?

Even my very basic UPS (APC Backup 1400) has a light on the front
labelled "Replace Battery".  That, combined with a very annoying high
pitch scream, are pretty good motivators to do the job.

I know the Backup 1400 was mentioned in this thread as "probably avoid"
(or something similar), but it's served me well thus far.  Had to replace
the battery pack only once.  That was after ten years, not the three to
five that people have been talking about.  APC no longer sell that
model, but battery packs are still available.  Just as an FYI, the
battery packs are sealed Lead-Acid.

Where I live (UK), it's possible to sell lead-acid batteries to scrap
merchants.  Amount paid is variable and subject to massive market forces
that are best described as 'volatile'.

Like others have mentioned with some of the more basic APC devices, this
particular model isn't designed with user replaceable batteries in mind,
but it's not an overly difficult task.  It can't easily (if at all) be
done leaving connected devices powered up, though.

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They take away our freedom in the name of liberty
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