Batteries

In this exercise we are inspecting batteries;
we are testing a conventional lucas battery with a 400 CCA rating
Battery number 128HD
we did an electrolyte test using a hydrometer.

The battery showed no signs of swelling (swelling is caused by over charging of the battery).

For safety in this exercise  we should not that the nearest sink in the room is on the far side of the room from the door and that safety glasses are to be worn during this exercise.

apon testing the electrolytes we attained the following results

Cell 1: High reading

Cell 2: High reading

Cell 3: High reading

Cell 4: High reading

Cell 5: High reading

Cell 6: High reading

The O.C.V was 6.60v on a 20v scale, which results in the battery being less than 25% charged

as the battery needs to be atleast 50% charged we have to charge our battery before any more tests can be done so we put our battery on the battery charger.

The voltage of a 50% charged battery is 12.4v, After charging the battery we did an electrolyte specific gravity test on it the hydrometer test gave the readings:

Cell 1: 1.250

Cell 2: 1.250

Cell 3: 1.225

Cell 4: 1.210

Cell 5: 1.250

Cell 6: 1.250

The gravity variation of this battery is 0.04.

The allowable variation is 0.25-0.50, this concludes that our battery cell variation was a pass result.

Next is a battery load test, for this test the battery needs to be atleast 50% charged(12.4OCV)
In this exercise the battery we are using is a conventional lucas battery with a CCA rating of 310.
We are going to apply a load of 155Amps(Half the CCA rating), the voltage held must be atleast 9.6v at 155Amps we will apply the load for a maximum of 15 seconds.
After applying the load of 155Amps for around 15 seconds the voltage held on this battery was 10.6v which was a pass result.

The next test we did was a digital battery test this time we are using a lucas conventional battery model number: NS40210 with a CCA of 310, we saw the "SAE" letters flash across the screen we changed the CCA rating to suit the battery, the CCA rating was successfully changed,
upon testing the digital meter read as a fail for the test this was due to possibly corroded terminal connections or corroded terminals, the OCV on this battery was 12.87v the CCA calculated from the digital meter was 225CCA when comparing to the column provided it indicates that the battery is over-charged.
given the condition of the battery it is advisable that it is replaced as well as the terminal clamps being cleaned with a soda/water solution.