the bolts SHOULDN’T be current carriers, that is for the bus bars. the only thing they should do is hold straps tightly to the battery to prevent fretting corrosion. They will however carry up to about 400 amps for a bit depending on how hot you allow them to get. measure bolt resistance then use Ohm's law for watts to be dissipated.
lock washers have no effect on terminal resistance on a properly torqued bolt.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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