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HiTech's avatar
HiTech
Explorer
May 23, 2013

Checking hydrometer accuracy with charged battery voltage

Is it true that: Specific Gravity = Cell Open Circuit Voltage - 0.845? Could one average the specific gravity readings across cells in a battery, and use this formula to check the accuracy of th...
HiTech's avatar
HiTech
Explorer
May 24, 2013
Is that too high? My AGMs do 12.94 after 24 hours and my always float charged flooded Duralast gets up over 12.8 after a 24 hour rest. I wonder where yours would stabilize out at.

Jim

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