![]() 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 Follow the instructions on your car battery tester to connect the terminals to the correct points on the car battery.Just make sure that you have easy access to it in order to correctly connect the wires. You can test your car battery without having to disconnect it from the car.Remove the car battery tester from its packaging and find the instructions for use.You may want to put on gloves to protect your skin from any possible acid leaks.Ensure that the engine is not running and open the car bonnet.This will allow enough time for any surface charge to run down and if your battery has problems retaining charge then it will be easier to spot if you wait a bit. To get the most accurate results of your battery’s performance you should wait 12 hours after having switched off your engine to test the charge level. The first test you will need to carry out on your battery is to determine how much charge it has. Testing your car battery on a regular basis couldn’t be easier with the help of a car battery tester. Get quotes for a Battery Job How to test your battery ![]() Keeping an eye on your battery and regularly checking its performance is the best way to avoid this from happening. It can ruin your plans for days whilst you work out alternative transport arrangements and get any potential maintenance problems fixed. There is nothing more annoying than going out to your car in the morning and finding that the battery has gone flat and the car won’t start.
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