u/RelevantYesterday468

I have a 2019 M240i with 95k miles. I bought this car a month ago. Today in the morning I got a message saying increased battery drain while stopped. It also says vehicle battery charge low. I checked codes in bimmerlink and also checked the state of charge and it's at 16% right now. I checked the state of charge 2 days ago it was at 78% everything was all fine until this morning. I also checked the voltage today while idling it was around 14.3v then it went to 15.3 then back down. The battery is only 1 year old. Could it be a bad alternator?