It feels kind if dumb to see such configuration and I have worries If I drain small 12v battery by using car with engine off It wouldn’t start…
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The main reason why you will alway have a low voltage battery is safety: It is used to actuate the contactors for the HV Battery. You would not want un-switchable HV components. For example in the event of a crash the HV battery gets completely disconnected but airbags and indicators will still work. The 12v battery will get charged off the main hv battery if it gets low btw.
