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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.

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