Very bad indeed, you can't equalize the cells when they are in the car and because of the minute fallback allowed per cell is 0.03 volt. After a couple of runs they won't be equal voltage and when you charge you've a couple of cells that will peak early so they'll get over charged. They will either vent and be ruined or explode.
NIMH cells are useless, unstable and can be hell of a lot more dangerous than lipo cells. They are the worst thing to happen to the hobby IMO.
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