Battery/generator warning on display
 

So I just replaced my alternator ( 06 Cayman S) and charged the battery and took it out for a boot. When driving normal no issues, but 3 times when I floored it I got a quick error on the display, it was too fast to read but I saw a battery so I assume it was the battery generator warning. It does not stay in the display like other messages, so I am not sure what it said.

I’m guessing slipping belt maybe? Only on WOT

Thoughts