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(1) Determine the number of degrees above or below 26.7° C (80° F): 26.6° C - -12.2° C = 38.8° C (2) Divide the result from Step 1 by 5.5° C (10° F): 38.8° C 4 5.5° C = 7 (70° F 4 10° F = 7) (3) Multiply the result from Step 2 by the temper- ature correction factor (0.004): 7 X 0.004 = 0.028 (4) The temperature at testing was below 26.7° C (80° F); therefore, the temperature correction factor (5) The corrected specific gravity of the battery cell in this example is 1.212. Test the specific gravity of the electrolyte in each battery cell. If the specific gravity of all cells is above When the specific gravity of all cells is above 1.235, and the cell variation is less than fifty points (0.050), OPEN-CIRCUIT VOLTAGE TEST A battery open-circuit voltage (no load) test will show the state-of-charge of a battery. This test can be WARNING: • IF THE BATTERY SHOWS SIGNS OF FREEZ- ING, LEAKING, LOOSE POSTS, OR LOW ELECTRO- • EXPLOSIVE HYDROGEN GAS FORMS IN AND AROUND THE BATTERY. DO NOT SMOKE, USE • THE BATTERY CONTAINS SULFURIC ACID, WHICH IS POISONOUS AND CAUSTIC. AVOID CON- • IF THE BATTERY IS EQUIPPED WITH REMOV- ABLE CELL CAPS, BE CERTAIN THAT EACH OF THE BATTERY IS RETURNED TO SERVICE. PER- Before proceeding with this test, completely charge the battery. Refer to Battery Charging in the index (1) Before measuring the open-circuit voltage, the surface charge must be removed from the battery. (2) Disconnect and isolate both battery cables, neg- ative cable first. (3) Using a voltmeter connected to the battery posts (see the instructions provided by the manufac- See the Open-Circuit Voltage chart. This voltage reading will indicate the battery state-of-charge, but LOAD TEST A battery load test will verify the battery cranking capacity. This test is based on the Cold Cranking Fig. 8 Testing Open-Circuit Voltage - Typical Open Circuit Voltage Open Circuit Volts Charge Percentage 11.7 volts or less 0% 12.0 volts 25% 12.2 volts 50% 12.4 volts 75% 12.6 volts or more 100% DN BATTERY 8A - 11 DIAGNOSIS AND TESTING (Continued) |