Same. iPhone 6s, iOS 14.2, battery went from 98% to complete shutdown after about 5 minutes on a game twice in last 24 hours. It reboots without plugging in, then shows battery at 10%. A few other times it has jumped from 100% to 64% in a matter of minutes. Also dies after 30 minutes on video call. After plug in, recharge is very fast. I submitted a report to the link someone else gave above.
Ice_Cream123
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