A fully charged battery will have a reading of between 2.12 and 2.15 volts per cell, or between 12 and 13 volts per battery. At 50% the reading will be 2.03 VPC, and at zero it will be 1.75. For a fully charged cell, specific gravity is 1.265, and 1.13 for a totally discharged cell.
Let's Get It Fixed!
HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.