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I'm building a project with Raspberry Pi and some other electronics driving the LEGO Power Functions M-Motor (8883) and I need to know how much current those motors draw under load.

Has anyone done tests and put together a spec sheet for these motor's electronic characteristics?

This is my first post here on LEGO Answers! Hopefully this sharing is welcome.

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YES! Philippe Hurbain (Philo) has put together a great and very detailed write-up on those and many other LEGO 9V electric motors.

You can find it here: LEGO 9V Technic Motors compared characteristics

Your current draw for that specific motor @ 9V is:

No load:              65mA  
Loaded (3.6 N.cm):    310mA  
Loaded (6.0 N.cm):    480mA  
Stalled (11 N.cm):    850mA

I was about to ask this very question when a friend pointed me to this write-up.
Hopefully someone else will find it as useful as I did.

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    I found his web site very helpful when I had do find a fitting H-bridge to control LEGO motors with my arduino – MrSmith42 Dec 26 '15 at 14:44

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