The same issue on my MBP 13" Intel 2018. Battery level drops by 2% every 15 min. Ventura doesn't have such an issue. The issue appears on clean Mac OS Sequoia installation thus it is not 3rd party problem. I have reset SMC and PRAM also. Nothing changed.
System log trashed by tons of power messages every 100 ms
default 11:16:27.562731+0300 kernel IG:: disableDC6:5540 Disabling fast DC6
default 11:16:27.562760+0300 kernel IG:: hwWriteMailbox:4246 (command=22, data=0)
default 11:16:27.563954+0300 kernel IG:: hwWriteMailbox:4309 return
default 11:16:27.563977+0300 kernel IG:: hwSetPowerWellState:6912 PW: Updating power well hardware state to 0x20000002
default 11:16:27.563985+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x30000002
default 11:16:27.563991+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x30000003
default 11:16:27.563996+0300 kernel IG:: hwSetPowerWellState:6934 PW: Power well hardware state has been updated
default 11:16:27.563999+0300 kernel IG:: hwSetPowerWellState:6912 PW: Updating power well hardware state to 0x2000000a
default 11:16:27.564007+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x3000000b
default 11:16:27.564013+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x3000000f
default 11:16:27.564016+0300 kernel IG:: hwSetPowerWellState:6934 PW: Power well hardware state has been updated
default 11:16:27.564300+0300 kernel IG:: restoreStateForFastDC6:24105 Restoring registers for fast DC6 exit. secondPart=0
default 11:16:27.564413+0300 kernel IG:: restoreStateForFastDC6:24105 Restoring registers for fast DC6 exit. secondPart=1