Well I have a 36 volt dewalt cordless drill and one of the batteries stopped working. I took it apart and found 9 out of ten cell where good so they where free to me.
Anyway Im still trying to find out should I run the speed controll on NIMH or Lipo
well, I'd start on lipo. If it behaves oddly, like starting and stopping it may be because you are hitting the low voltage cutoff circuits limit. then switch it to nimh.
If it runs fine in lipo leave it.
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.