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used 18650s are a LOT of work for a diminished return. Basically you have to make a test rig that reconditions them and gives you the stats (AH, leakdown, internal resistance), plus a prequalification charge if they are dead, and plenty of new concerns if they are dead, x 3000. Plus you should "fuse" them individually. And paralleling them takes a little time too. And they might only be good for 1AH.
It may be a good project for you or not, just want you to be aware of the magnitude.
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