I picked up the subject warning Friday. Car seemed pretty normal. Did not attempt to charge that day. Saturday the warning went away. I charged overnight Saturday night, car charged to 90% as requested. Sunday morning the warning was back. I did some running around then went in to work to support the launch. I was down to 21% (seemed like a lot of battery drain for my driving) when I got to the parking garage and plugged in to an available HPWC (40 A). Car would not charge. Message said "Charge complete". Oops. After launch scrub I drove around the corner to the Hawthorne supercharger. No love there either. I figured I had enough to limp it to my home Service Center, Buena Park. Made it there with 4% left. Dropped the key and a note in the drop box and Ubered home. This morning they call me at 8:40 and I tell my story. They said they would get to it today. Two and a half hours later I get the call - bad battery. They are going to find me a loaner battery (time TBD) then send my battery to Fremont for repair. No loaner cars, as expected. That's OK I'll drive my truck. Not whining, just sharing my story as I did an internet search and did not find any other stories about my specific warning message. Everybody at the Service Center was great, as always. So, if you see the above warning message, know that your battery may not take a charge and you may need a battery replacement.