The Hydrometer is used to check the Specific Gravity of the battery electrolyte solution, sometimes referred to as the State of Charge.
A hydrometer can be used to determine if a battery has a bad or weak cell. All cells in a battery should match.
For example, if 5 cells in a 12 Volt battery read 1100 on a hydrometer, and 1 cell reads 0, the battery has one bad cell and should be discarded. |