Re: Lead acid battery tester

On 15 Apr 2025 at 12:55:49 BST, "Liz Tuddenham" <Liz Tuddenham> wrote:

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

On 2025-04-15 13:30, Liz Tuddenham wrote:
 
...
 

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.
 
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.

The brand leader American UPS company used to be noted for overcharging its
sealed lead acid batteries (to be kind it could be called getting the maximum
spec from the batteries) which probably shortened their life and there were
published circuit board mods to stop it doing so.


--

Roger Hayter