On 22/04/2021 14:37, Dave Plowman (News) wrote:
In article , Roger Hayter
wrote:
On 22 Apr 2021 at 12:18:49 BST, "Adrian Brentnall"
wrote:

On 22/04/2021 11:14, Dave Plowman (News) wrote:
In article , Brian Gaff \(Sofa\)
wrote:
What somebody electronically minded did on a battery where you can
actually get at the cell interconnects, few these days, sadly, he
put a monitor so it looked at every cell on its own and then he
could tell the weak cell or cells, but as to what to do with such
info, who knows? I'm surprised modern car electronics do not
already allow this like they tend to do on Lithium cells these days.

Given there's nothing you can do about a faulty cell in a car
battery, not much point?


As we used to say in industrial automation

"Never check for an error condition you can't handle"

Good advice.

The main one is never create a system where a fault one sensor can break
a correctly functioning piece of equipment. 737 Max failed that way.

It is a sound reason to replace a battery if you are not sure whether to
do so.

Given the cost, makes sense to have it tested first? There are
sophisticated testers that give an instant readout of the condition. A bit
too expensive for DIY, but a decent spares place should have one. ACT is
one such.

However, if you charge the battery with one of those £14 Lidl chargers,
and it struggles to start the car, there's a very good chance it is faulty.

The acid test is will it start the car the following day after being
taken off charge. A newly recharged car battery has to be incredibly bad
not to be able to start the car at least once. Mine had been on its last
legs for a while but the lockdown this winter finished it off.

--
Regards,
Martin Brown