[TriLUG] reason not to mix batteries in UPS

[Roger Broseus via TriLUG]

On January 8, 2023 8:46:41 PM David Burton via TriLUG <trilug at trilug.org> 
wrote:

> The whole point of a UPS is to improve reliability, so the *un*reliability
> of their batteries is especially annoying.
>
> I've considered replacing a 12v lead-acid battery with four LiFePO4
> batteries, like these:
>
> https://www.ebay.com/itm/203613239129
>
> Has anyone on the list tried that?
>
> LiFePO4 batteries are supposed to sacrifice some of the energy density of
> "regular" lithium-ion batteries for much improved longevity.
>
> Dave
>
>
> On Sun, Jan 8, 2023 at 6:45 PM Joseph Mack NA3T via TriLUG <
> trilug at trilug.org> wrote:
>
>> On Sun, 8 Jan 2023, shay walters wrote:
>>
>> > I've become an advocate of replacement on a schedule rather
>> > than waiting for them to die.
>>
>> Hi Shay
>>
>> well that's a good idea (didn't occur to me). This will save the house
>> being filled with beeping noises, when I'm trying to sleep, until the new
>> batteries arrive (as well as save me from swollen and leaking batteries).
>>
>> I used to do this with disks, but they last so much longer now that I just
>> leave them till they fail (and they aren't failing).
>>
>> I've just put a note in the calendar on my phone.
>>
>> > I try to replace on a 3-year schedule, but I'm such a procrastinator
>> > that the actual dates end up more like 4 (or 5) years - that's why I try
>> > for 3.  :-)
>>
>> I've never got more than 2.5 years from a set of batteries. They're at
>> 13.2V (I seem to remember) so they're not being charged hard. How to you
>> get 5, 4 or even 3 years out of them? Is it the battery? (One of the
>> Duracells leaked badly at 2.5yrs.)
>>
>> Joe
>> --
>> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
>> Don't upgrade a working machine - it won't work any
>> better - it could work worse; it may not work at all.
>> Homepage http://www.austintek.com/ It's GNU/Linux!
>>
> --
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The ad says "used" in very fine print! eBay!