Red Triangle, VSC, Chekc engine, brake - all lit up

No need to be so defensive, I was just pointing out that you seemed to have missed that the battery was initially 12.9 V and after your 5 min headlight test, it had recovered to 12.8 V after 1 minute standing. If the poster had waited the full 5 minutes I wouldn't be surprised to see it that it recovered right back to 12.9 V. By your own posts in the past, you would judge that as nothing wrong with the battery.