![]() The AA came out jump started it and battery checked ok – took it to place I bought battery and they checked it ok too so I left it and just monitored the voltage each morning. Hi, had a problem with my car battery back in August where I left it for a couple of days and the car was completely dead – battery read 6.5v. There is not enough power left to give enough voltage to a motor that draws too much current but the chemicals will stabilize for a while longer and give enough voltage to a tv remote or clock because their operation draws much less current from them. Like batteries from a toy with a motor to a clock or a tv remote. This is why if batteries seem dead in some high current appliance, you can still use the batteries in low current appliances. The chemicals in the batteries will stablize showing they have a Voltage but when current is trying to be drawn you can see that there is no actual power left. ![]() But turn it off and take the batteries out and they’ll show 0.8V or even a higher while they really are depleted. When they connect their tester on a half charged battery, they will see a much lower Voltage because they are also drawing a very high current (A) and such having the real measure of the power (W) that the battery can still provide.įor example if you have depleted alkaline batteries in a torch with a bulb light and you turn it on, a multimeter will show near 0V on the batteries. In car garages they use testers that also draw a very high current (A) replicating the very high current a starter motor uses to start the engine. These have a very high resistance and draw extremely little current while taking the measurement and so the Voltage (V) is reported high relative to the actual charge (VxA) left. Since it is handy to take these measurements at home, the guide is written to use a simple multimeter. It’s also important to note that a battery is not mechanical but a chemical process so it follows different rules. The power of a battery is the product of Voltage and Ampere. It is worth keeping a noted of the voltage readings so you can compare them overtime. We advise that you check your car battery a couple of times each year, and in particular towards the end of autumn before winter sets in. Without a fully functioning battery you run the risk of being stranded and unable to start your car. The car battery also stabilizes the circuit voltage of the car when the engine is running, protecting the electrical systems from voltage spikes. Once the engine is running the power for your cars electrical systems is provided by the alternator. When you start your car the battery provides the high energy (current) needed to the starter motor, which in turn turns over the engine. ![]() And importantly it provides the necessary “spark” to get the engine turning over when starting your car. Your car battery provides your vehicles electrical needs when the engine isn’t running. Knowing your car batteries voltage is important in understanding the condition of the battery and the likelihood that it could fail.
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