Vxr8 Alternator or Battery Fault

[SteveB VXR8]

Guys, on start up yesterday battery light came on & Alternator fault came up on the dash.
After about 2 mins running fault cleared & charging normally 14-15v.
Checked Eng Mode battery 77% charged, 12.7 volts engine off.
Battery is 2 years old Bosch. Terminals ok no corrosion.
No fault codes.
Thoughts please.

[FishmanUK]

When my alternator died the voltage would drop down to 11.5-12v after a while running and then jump back up to 14-15 for a time. As it got worse it would spend more time not charging. After a few days I started to get the alternator warning light also and eventually it stopped charging completely. Then it was car to Monkfish on the back of a recovery vehicle.

I was able to drive at least 10 miles without alternator running car eventually goes into a low battery usage mode.

I would keep an eye on the voltages and see if it repeats.

[SteveB VXR8]

Update....
Garage has tested battery & alternator output. Both fine.
So will see how things go over the next few days.
Any similar experiences?