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alan_m alan_m is offline
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Default OT: Car battery volt drop

On 26/04/2021 19:06, Michael Chare wrote:
On 26/04/2021 08:54, alan_m wrote:
On 26/04/2021 07:50, RJH wrote:

If only - the first warning I had of a failing battery was the dash
dials
going haywire, and then the car came to a stop.


Albeit on a 5+ year old battery I once had a failure overnight. The
previous day it started the car which had been sitting for 18 hours in
temperatures below 0C.* It started the car a couple of more times
during the day. Previously there had been no indication of a failing
battery and my daily commute was 30+ miles. On the morning of the
failure the dash lights came on for a second or two and then dimmed to
nothing, a turn of the key resulted in zilch. A morning on the charger
did nothing.

A new battery restored everything to working order.



What sort of battery did you have.


This was many cars ago so no idea.


I now have a car with an AGM battery
for stop start.* I am now wondering how long it will last and what a
failure will be like.* For the past 25 years my cars have normally
started very easily so I don't notice that the battery is failing. One
car would not start so I charged the battery, drove about 10 miles to
buy a new one and then the car would not start to come home until I
fitted the new battery. Fortunately I had the tools I needed with me.



Often in the "good old days" part of the problem with a failing battery
was a low starter motor cracking speed coupled with a poor spark. Then
came electronic ignition and then fuel injection and often if there was
enough in the battery to just turn the engine the car would start
immediately.



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