Before we started the battery test, we had to carry out some visual inspections first of the condition of the battery.We check to see if there was any corrosion on the battery surface and that there is no acid on battrery casing or by terminals. The terminals were clean and tight, no signs of warpage or expanding of battery case or swelling caused by over charging or cracks in case.The caps were also nice and tight with no showings of possible cracks in them from where the electrolyte can leak from. The battery had passed the visual inspection.
We checked electrolute level by first removing the caps in each cell . All six cells were showing a high level of electrolyte.
We did a (ocv) test and it gave us a reading of 12.6. this meant that the battery was a 100% charged. The specified voltage was 12.4 or above. This meant we could carry on testing the battery.
We performed a specific gravity test on all the cell's. All the cells gave a reading of 13.06 which is the colour green on the hydrometer. The allowable specific gravity variation is 25-50.we got 50. This reading tells us the state of charge of the battery. So we now know that the battery was fully charged.
We continued with batterys and we went on to doing a high discharge test on the battery.To do a high discharge test needs to know the cca rateing before we can put a load on, the load should only be put on for no more than 15seconds. To do the high discharge test the battery has to be 50% charged (12.4volts). The battery we were going to do the test on was 100% charged. The load we applied to the battery was 155A which is half of the battery cca Rating which was 310. The voltage that was held by the battery while the load was being applied was 9.5volts.
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