It is also much easier than you might think to connect the wires to the wrong terminals and short circuit the electrical system of the whole car. The acid inside the battery is highly corrosive and it can be extremely dangerous if not handled correctly so you should wear gloves at all times to protect your skin. It is perfectly possible to do it yourself, but you will need to be very careful if the old battery is damaged in any way. Can you replace the battery yourself?Ĭhanging your car battery is not an overly complicated procedure. If the test fails then you will need to replace your battery. Green is for good condition, yellow is if the battery needs charging or maintenance and red for when the battery should be replaced. Some newer cars will have an in-built hydrometer on the battery itself which uses colours to indicate the acid level. If you buy a hydrometer, it will come with exact instructions as to how to measure the concentration of the acid and what the readings mean. This is only necessary if your battery is non-sealed. The second test you can perform on your battery is to measure its level of sulphuric acid with a hydrometer. If your car has a maintenance free Ca/Ca or a VRLA 12V battery, a reading of 12.77V corresponds to a fully charged battery and a reading of 11.75V will mean that it is completely dead. The closer the reading is to 12.65V the better. ![]() 11.89V will mean that the battery is completely flat. The reading will correspond to the voltage stored in the battery, and how much energy it has retained over 12 hours will tell you a lot about the state of the battery itself.If your car has a standard Sb/Sb 12V battery, a reading of 12.65V will mean that the battery is fully charged. After a short while you should get a numerical reading come up on the screen of your car battery tester.If it is colder than this when you test your battery then you can expect slightly lower readings, which will not be a reflection on the performance of your battery. All of the figures given below are for batteries tested at 21°c. You should be aware that at colder temperatures, the readings will be lower. ![]() You should connect the red lead to the positive (+) terminal on the battery and the black lead to the negative (-) one
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