Hardwired dashcams indeed cause significant parasitic drain, which is easy to check with elm327 adapter - just plug it in diagnostic port and Car Scanner Elm Obd2 app can show the Quiescent Current Average from the last night.
Quiescent should be around -5mA to -13mA, anything over -25mA is a cause for concern.
This app will also show the state of charge of the starter battery (SOC).
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