Originally posted by Matrix
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I assume you are using a Temperature Compensated Hydrometer and compensating for temp differences? Assuming the temps are the same, the only way to get all Specific Gravities the same is to empty each battery into a common container, then refill the batteries, that is not going to happen.
Try this. Use your hydrometer like a Turkey Baster. Suck up electrolyte into the Hydrometer, and squeeze it back out as hard as you can without splashing several times in each cell so as to mix/agitate/stir the electrolyte up. You might have Stratification which means the heavier acid is at the bottom of the cell and water floating on top.
To be honest I do not think you have a real problem other than minor differences of acid to water ratio. Also make sure you are adding water properly to the correct level. After water is added you must give the batteries a proper normal charge from an AC charger followed by a EQ charge. 15 points spread is within normal parameters.
Post back what Trojan says. They are pretty quick to respond.
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