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this is probably a "natural" thing..
particularly if you added a fourth cell to three cells that you already had run for a while.
the voltage of the 4 cells will start to drop after a few minutes so it will start to run like a 3 cell. under the same conditions the 3 cell would run even slower.
also, when you run 4 cells you are using more current so the battery's voltage will sag more quickly.
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