Hi, Don't know if it will change something in reporting the same issue, but I experience the same probleme on a MacBook Pro (15-inch, 2017, 2,9 GHz Intel Core i7 4 cores, 16 Go 2133 MHz LPDDR3)
This mac cannot be used more that 1 hour without being charged. Battery shows Service Recommended. Battery with 563 cycles and a design capacity of 82% ....
This appears only after big sur upgrade
JP-S
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