You can acheive 3V with a couple of old cells. I use an old 4.8V pack (4 cells) to run in motors, and I only run in for a minute or so until the big sparks stop coming off the brushes.
All you are doing is bedding the surface of the brushes in without applying too much load and burning the brush and comm up.
It was never recommended to use part throttle on the ESC as the ESC "switches" on and off at high speed, so you are still getting high voltages on the comm. But I don't think it really matters that much!
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