Same issue with the non-beta 11.1. 13" 2018 Touchbar MacBook Pro. The day after I updated the battery failed (the last time I checked the battery life a few months ago I was at 98%). Couldn't start the computer for 2 days—just got the red dead battery icon on a black screen when trying to restart. Resetting SMC and PRAM did not help. Apple support sent me to a local certified reseller/service and they said top case/battery replacement was needed at ~$700 (I am out of Apple Care coverage I also discovered...). Not happy about it! I ran out and picked up a little MacMini so I can keep working while this gets sorted. It seems this may be a firmware issue in the SMC or Battery? Hope this gets acknowledged/resolved before* I need to replace the battery/top case. I also posted about this in the Macrumors forum (referencing this thread) to see how many people are experiencing this.

Hey everyone— So I let the computer sit on the desk for the past couple months while I tried different options proposed here and waited to see if the 11.2 update would fix this issue (it didn't)... a few days ago in this thread someone said they had their battery fixed this week... so I called Apple Support again. They escalated it, made me an appointment on Monday, and I picked up my out-of-AppleCare 2017 13" Touch Bar MBPro with a new battery this afternoon. Apple covered the cost and the dude who helped me said there is no official word but they are covering battery replacements right now. Also interesting... when dropping off my computer on Monday, the dude next to me was bringing his in for the same reason, and I was told I wasn't the first battery replacement drop-off of the day... Good luck!