What combination of motor/Receiver/battery boxes are possible/supported?

example: 2x XL motors, 1x M Motor, 1 light using 1 receiver and 1 battery box.

1 Answer 1


The present line of battery boxes all provide 800mA of current and have overload protection to ensure that this level is not exceeded. Here's what the LEGO website has to say about powering motors:

As a rule of thumb, you can drive 2 Power Functions XL-Motors, 3 Power Functions Train Motors or 4 Power Functions M-Motors at the same time from one Power Functions Battery Box.

That's the basic high-level view. LEGO provides more details about each motor. You can check these out on the element specs page. Here's a list providing the current consumption for each motor type under "normal conditions":

So, in order to stay within TLG's recommendations, you shouldn't be running anything totalling more than 800mA from the above list off of a single battery box. Also be aware that if you are doing things which require a lot of mechanical power, such as heavy lifting, your motors will draw additional power. A stalled XL motor will overload the battery box by itself, for example.

As far as I know, overloading the battery box doesn't cause any long term problems, so there isn't an issue with testing your configuration to see if the battery box can handle it.

  • Thanks for that. I'm trying to motorize my R2D2, a motor for each leg (tank tracks), a motor for the head and lights
    – user849169
    Jun 19, 2013 at 2:52
  • No problem. That sounds like a fun project. Good luck!
    – jncraton
    Jun 19, 2013 at 14:00
  • Thank you very much for this useful information. I did know LEGO recommendations before, but I didn't know anything about servo and L motors... so thanks a lot.
    – user6612
    Dec 27, 2015 at 23:38

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