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Rpm varies with the electrical load on batteryThis is normal. As the electrical load on the battery and charging system [alternator or generator] increases, the mechanical load on the drive belt and thus the engine iincreases, and thus pulls the engine Rpm down.

You need to have this issue checked out by a Professional Automotive Performance Technician [or at least someone who who knows what they are doing].

I suspect that the cure will be to adjust the "idle speed" of the engine "to specifications," which I also suspect will be an idle Rpm greater than that at which the engine is now set.

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Q: Whenever you use both the headlights and heater in your 2003 KIA Sedona the RPMs lower from about 800 to 300 and the lights dim what could be causing this since the battery was just changed?
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