I have two identical box designs with EV3 bricks. When I upload the same programs to both, one moves about twice as fast as the other.

Is there a reason that this might be happening? Is there anything I can do to update it?

  • 3
    Have you checked the batteries? Maybe one has almost-dead batteries? Commented Nov 20, 2017 at 19:45
  • I have fully charged both batteries and they are both reporting full batteries. I will try to swap out the batteries but right now it's not easily accessible from the design I've got, so I was just curious if this was expected or not.
    – Lori
    Commented Nov 20, 2017 at 19:59
  • 1
    Can you post your program, or at least the part with the Move blocks? Commented Nov 20, 2017 at 20:11
  • 1
    It's noticeable on a standard steering block - say at 75 power and going for a few rotations - on one brick that move may take a second, on the other, 2 seconds. i'll run and time it later today and post specific times, wheel diameters and rotations.
    – Lori
    Commented Nov 20, 2017 at 20:53
  • Are you sure the problem is with the ev3 bricks? Have you tried switching the motors? Maybe one is defective?
    – Phil B.
    Commented Nov 21, 2017 at 13:18

1 Answer 1


Some possible reasons:

  • A motor is defective
  • One of the brick has lesser battery charge
  • Firmware problem: make sure both bricks have latest firmware
  • 1
    it was the battery.
    – Lori
    Commented Dec 2, 2017 at 0:39

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