Mixed battery types

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hi,
this stupid question ok use mixed battery types in same machine. in case i'm using nimh batteries drive motors  , motor controller want use small light weight lipo battery drive rest of electronics. serial data sent arduino motor controller there has common earth between 2 circuits , hence 2 battery types. cause myself problems doing this?

thanks.

no problem, it's fine. don't want mix battery types in same (series) circuit, different batteries powering parallel circuits ok.

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