LEGO Mindstorms RCX, NXT, EV3 fake battery

Author: brm, published on 2013-07-24

Click this button to get the 3D model


are you bilding LEGO Mindstorms robots? are your batteries always empty? don’t have a battery at hand?
build your own PMB (poor man’s battery) … print out this fake battery to power up your Mindstorms RCX, NXT or EV3 from a power supply!


STL files tested on a Dimension 768 BST printer with support material … OK!
STL files tested on a Ultimaker printer without support material … OK!

  • print out all 4 parts …
  • organize M3 and M5 allen screws and nuts …
  • organize LED and resistor for 9V, some wire and a jack …
  • I would suggest a 9V DC power supply with at least 2000mA current …
  • solder … play … have fun!

Do not try to build this adapter if you don’t know what you are doing!
I shall not be held responsible if you burn your RCX, NXT or EV3 with incorrect voltage or bad polarity!

License: Creative Commons – Attribution – Non-Commercial

Tags: 9V, Battery, EV3, LEGO, Mindstorms, Mindstorms_EV3, Mindstorms_NXT, Mindstorms_RCX, NXT, RCX