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stepping down voltage for ADC sampling

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i'm working on a telemetry project. i'd like to sample the rc battery (3S lipo) and my video tx battery (a 4.8v nimh pack). what's the recommended way to step down this voltage for sampling with an ADC on atmega? i figure i could just use a voltage divider for each pack. is there a better (more efficient, better isolation, etc) way? thanks alot.

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