« Back to Dictionary Index

A battery tester typically refers to:

  1. Voltage Meter: A device used to measure the voltage of a battery. It helps in assessing the state of charge by indicating the voltage level across the terminals.
  2. Hydrometer: A tool specifically used for lead-acid batteries to check the specific gravity of the electrolyte. This measurement provides information about the battery’s state of charge and health.

Both tools are essential for diagnosing battery condition, whether it’s checking voltage levels or specific gravity to determine if the battery is properly charged and functioning correctly.

Related Articles:
Alternative Meanings:
  • Battery Tester

    Battery Tester:

    A battery tester is a device used to assess the state of a battery, particularly its charge and health. One common type of battery tester for lead-acid batteries is the hydrometer, which measures the specific gravity of the electrolyte in each cell.

    Key Points about a Battery Tester (Hydrometer):

    1. Function: Measures the specific gravity of the acid mixture (electrolyte) in each cell of a battery to determine its state of charge.
    2. Operation:
    • Suction: Fluid is drawn into the hydrometer by squeezing and releasing the bulb.
    • Measurement: The scale inside the hydrometer indicates the specific gravity of the electrolyte.
    1. Reading the Scale:
    • High Specific Gravity: Indicates a fully charged cell.
    • Low Specific Gravity: Indicates a discharged or weak cell.
    1. Usage:
    • Ensures all cells are uniformly charged.
    • Helps identify weak or failing cells in a battery, which can prevent premature failure.
    1. Safety: Since the electrolyte is acidic, proper safety precautions such as wearing gloves and eye protection should be taken when using a hydrometer.

    Using a hydrometer battery tester helps maintain and prolong the life of a lead-acid battery by ensuring it is properly charged and identifying cells that may need maintenance or replacement.

« Back to Dictionary Index