Alternator and AGM battery

[lab4games]

4 years old AGM battery went totally flat one day. Did a replacement and the battery vendor did a voltmeter test and said the alternator had low voltage and mentioned New Battery runs risks of depleting.

 

Went to my mechanic for a batt test and was given this result. It showed  charging test result as low.

 

Car is 7.5years old. Is the alternator on its way out?

 

 

Edited 15 November, 2023 by lab4games

[ords]

Probably too late now, but why didn't you get a charge test done first?

Has the new battery been coded into the system so it knows there is a new battery i 

[Breezy_Pete]

The fact that battery type is shown as regular, with no mention of AGM makes me not trust that test set-up.

I suspect it also isn't taking into account the variable output voltage nature of an alternator in a start-stop car. Makes it trickier to test than traditional fixed voltage alts.

[lab4games]

I couldn't start the car to drive to a workshop. I thought it would be a simple battery replacement as the first battery died without warnings as well at near the 4 years mark. 

[ords]

27 minutes ago, lab4games said:

I couldn't start the car to drive to a workshop. I thought it would be a simple battery replacement as the first battery died without warnings as well at near the 4 years mark. 

Was it coded and is it an EFB or AGM?

[lab4games]

AGM. Coded when it was first changed