Re: Lead acid battery tester

On 2025-04-15 13:55, Liz Tuddenham wrote:

Carlos E.R. <robin_listas@es.invalid> wrote:
 

On 2025-04-15 13:30, Liz Tuddenham wrote:
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However, it is usually  a good enough indicator for obvious cases of
dying batteries that collapse after a few tens of seconds or boil-up
under heavy load.

>
That's the case, the battery went down fast. The UPS software had the
time to send me an alert email, but the event did not get written to
disk logs. The battery would make 2 years in service next august.

   I would have expected a much better lifetime than that,  Does the
charging system follow the battery manufacturer's guidelines?
Continuous trickle charge can ruin a battery that isn't designed for it,
some batteries thrive on an occasional discharge and re-charge.

That's a good question without an answer. It is a black box. I don't know what it does. Ok, it is a commercial UPS. I have found that some commercial UPS take care of their batteries better than others.
Another possibility is that the battery is lower quality, being no-name.
This UPS is a Salicru "UPS Soho+". The other one I have is an "Ellipse 1000", from Eaton, and this one is good.

 Battery technology is extremely complex.  There are so many ways of
killing a battery; 'good practice' consists of juggling them to give the
best compromise.

Trickle charge in a traditional lead acid wet battery just "evaporates" the water in the electrolyte (ok, it produces some hydrogen). You just have to replenish the water periodically. But on these "new" gel types, the battery dies.
--
Cheers, Carlos.