I purchased some used Valence lithium batteries from ebay a while ago and just got the rest of my electrical components so now I am building a small system to do a bench test.
One thing I discovered is that the bolts that go into the battery are not all the same size and also the positive and negative terminal holes are not the same depth. Say whaaaa???
The result is that the positive bolts tighten down well, but the negative bolts bottom out in the hole before the battery cable is tight and secure. This is ok where I have two cable connections (the ends of each series where they are connected in parallel to the other series), but the middle of each series is loose on the negative terminal. I am thinking of either cutting off the end of those bolts or else add a metal washer.
The question I have is if I get metal washers, what material should they be? Stainless steel? Copper? Other???