Nothing wrong with the SCRT-10, its a great bit of kit for the money...
we have 4 of them at our club and never seen a problem electrically.
With 540 size motors they do run warm because of the high current draw... they weigh a lot and there is the rotating load of 1/8th size diffs and gear pitch.
i ran a 6.5T Fusion Fusion motor with the Fusion Comp 150A speedo, Savox 1256 servo with Spektrum radio... never a problem.
I would suggest either your transmitter/reciever is dodgy, or you haven't calibrated speedo properly..
LiPo batterys shouldn't make a difference unless your speedo is set rated at 7.2V or you haven't got a cut off voltage setting and then the LiPO's tend to explode!
If you have a low C rated LiPo and you are drawing big currents then it may cut off or if your speedo is not rated or high currents then it will either cut off or fry, can't see it effecting steering though... unless as said above... its fried and not giving reciever/servo proper power
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