Battery Visual Inspection - 1

Battery Visual Inspection - 1:

SPECIFIC GRAVITY CHECK CHART
The specific gravity of battery electrolyte changes with temperature. Heat thins the solution and lowers the specific gravity. Cold thickens the solution and raises the specific gravity.

A fully charged battery should have a specific gravity between 1.260 and 1.280, with the electrolyte temperature at 26.7 °C. The specific gravity reading must be corrected by adding 4 points (.004) for each 5.56 °C above 26.7 °C or subtracting 4 points for every 5.56 °C below 26.7 °C.

For example : The hydrometer reading is 1.280, and the electrolyte temperature reading is 5.56 °C. According to the chart, the specific gravity must be lowered by 0.028 points. The true corrected reading is 1.252.

1.280 - 0.028 = 1.252




You should never take a hydrometer reading immediately after water has been added. The water and electrolyte must be mixed by either charging for a few minutes at a low rate or by allowing the battery to sit for an hour.

CAUTION: A difference of 50 points (0.050) or more between one or more cells indicates a defective battery. It should be replaced.

Battery Charge Rate: