All the sudden the battery was dead. I charged it up using a slow charge. 5 amps for about 20 hours. All was well for 2 days. Day 3, dead battery. The battery is only a year old. I pulled the battery (still dead) and went to walmart to test it. After 20 minutes they said it was fine. I'm skeptical about this 20 min charge but who knows... So, I got home and ran a battery drain test using a multimeter. In the engine compartment the "infotainment" fuse was drawing 1.8 amps. The fuse box inside the car had a fuse at .89 amps. I'm guessing 2.7 amps draw is A LOT... Too much? if so, why would the infotainment do that? I've had the car for 5 years and not had a single issue with it. I take that back, the only issue I have with the regal is the infotainment system. It never saves my settings. It puts my time zone as east coast no matter how many times I change it. There are a few other weird issues with the infotainment but they don't bother me too much. Not sure what my next step is. I'd rather not take it to a dealer. A few years back I was going to have the infotainment system updated but they wanted almost 200 bucks which seemed a lot to me for a software update. Now I'm wondering if an update would stop the current draw when parked? I suppose I can pull both fuses and use a bluetooth speaker with my cell phone but obviously, I'd like to get to the bottom of it.

Thanks for any insight in advance.

Lead acid car batteries generally do not fair well/last much longer when drained right down.
It would be best to get your battery re-charged again, and then load tested to prove it'* still acceptable.
What is the output voltage from your alternator?
Having a 1.8 amp draw from the infotainment center is not acceptable.
Even tho i do not see any similar issues online re this drain, it would be best to try to get the wiring diagram of this circuit.
Anyone here have access to the wiring diagram for this member?

I think he needs to verify the infotainment is going to sleep first...

https://gm-techlink.com/?p=6831

Mike, thanks for the link. much appreciated. I did actually wait until everything went to sleep. When I started the testing, it was at 5.8amps. Then over the course of a half hour, it stabilized at around 2.7 amps. The door sensor triggered a bunch of stuff. I usually block off the sensor but there is no external sensor on the regal. So, I have to play the waiting game.

Thanks for the reply soft ride. at this moment, I'm currently charging the battery at 4amps with a pretty nice charge controller. I agree, I need to start with a known good battery. I've searched for a diagram but have had no luck. I'd love to see what that circuit looks like. The fuse inside the cabin that'* drawing .89 amps is the radio. So, radio and infotainment are the culprits.

How old is the battery?

How many miles on the car?

What is the voltage measured at the battery with the ignition off?

What is the voltage measured at the battery with the engine idling?

12.6 but I'll need to check it again now.

After a few hours, I don't like 7.5 volts. Even with a 1.5 amp draw, that battery should still show 12 volts even after a day. Seriously, stay away from Autozone, most of those kids don't know anything.

Agree w/ Mike ^
I'd recommend a 2nd opinion, having another load test done at a battery shop. How many CCA is your current battery?
If possible always try to find the largest CCA possible.(800+ CCA)
AGM (absorb glass mat) car batteries are deep cycle & will recover better than any lead acid, and perform better in cold.

I agree 100% about the kids from autozone and other chain stores. However, they use systems that remove the inexperience now days. The battery testing equipment is dummy proof. They just press the button. They don't know what the load is or any other info... just green light or red light.

The battery is 730cca. So I just installed the battery. It'* at 12.3 volts with key off. With engine running, it'* getting 14.7 volts. I have pulled both of the fuses for the infotainment center. before starting it I checked the amp load with both infotainment fuses installed. It'* 2.5 amps. With both fuses removed, it'* down to 90 milliamps. So, still a draw somewhere but not bad. My hunch is that it will be fine now. Which means I still have to figure out why the infotainment is drawing a continuous 2.78 amps. No other regal owners reported this?

How long are you waiting when testing the draw for the info center? Remember, these modules tend to take awhile before going to sleep.

Can you give it a couple hours in between testing?