I believe what is happening is that the engines throttles are set to match a speed.
Wether or not the load of a generator is in the loop.
Once the batts are topped off the throttle is reduced slightly maintaining the ordered speed.
Havent done any tests to confirm but I believe the fuel consumption is higher when charging batts.
Ive also notice that when flank is ordered if you switch off the battery charger you get another knot or two of top speed.
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