12.x Volts After New Battery and Alternator

[blockhead76]

Hi, all.

I just installed a new H6 (680CCA) battery and a remanufactured OEM alternator.

I programmed the battery using Carly and set it to 80ah.

After completing this, I notice that while driving the car, the hidden menu on the dashboard constantly reads between 12.2 and 13.1v. It has even gotten down to 11.x but if I rev the engine it goes back to 12.x.

Could this lower reading be caused by the 80ah? The car seems fine and has been driven for about 75 miles after the new battery and alternator.

I did take it to AutoZone for them to check the battery and alternator with their tool and they said the battery was at about 42% charged so I came home and left it on a tender overnight.

Any ideas on what could be causing this? I think I should be reading between 13 and 14 volts, right?

Any help is greatly appreciated - thanks in advance!

[blockhead76]

I just went out for a drive and left my phone/Carly connected so I could record the output.

I drove for about 30 minutes and then sat in the driveway for another 30 minutes with the car idling.

You can see in the video the voltage ranges from 12.19 to 13.2.

The car felt fine the whole time with no issues at all. Am I misinterpreting something? I find it hard to believe my car would run for an hour on the battery alone.

https://streamable.com/ce84g7

[blockhead76]

One more update: I just checked the battery with a multimeter and got 12.2v with the car off and 13.4v with the car idling. I think everything is fine?