Did you weigh each battery? Or did you weigh a few and multiply out the remaining?
I ask because in wet lead acid batteries the water does evaporate at different rates. If you are dealing witb 10,000 lbs at a shot, basically 100 batteries at a time the difference in water levels inside batteries could explain discrepency.
I have been doing solar battery banks and literally had two deep cycle batteries bought and used weigh 4 lbs different after 6 months...just my .02.
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