Note: The figures are based on open circuit readings.
A voltage value of 12.7 volts and above indicates a 100 percent charged battery. It’s the tried and true method, for well over 100 years. We both have something to offer here, for others to consider, or not. Connect the black lead to the negative terminal.
The battery posts could be corroded the fluid could be low in one or more cell or the battery could just be bad. Do a load test on the battery or bring it to a parts store and have them test it for free. Check the battery voltage again, if it is still below 12.4v it is worth taking it to a garage to get professionally checked. Battery Myth | Why is My 12 Volt Battery Reading as 13 Volts? Ano ang Imahinasyong guhit na naghahati sa daigdig sa magkaibang araw?
I never realised it was something worth getting checked, but I’ll be popping down to my local garage to get it done. As a battery is charged the indicated voltage increases and, as discharging occurs, the indicated voltage decreases. Volts and amps do not necessarily correlate. For 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. They’ve been on the slow charge all night long and show 9 volts.
If you are 13 years old when were you born? If so, you can measure its density with a hydrometer, a few $. This machine uses a combination of charge, load and conductance tests to check the battery. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries.
With the engine off, you should get a reading of 12.6 volts.
My Dear Watson , I believe we can call that a Clue . How can i fix this problem? For lead-acid chemistry, as in a car battery, think 13.6 volts So ya don’t have to spend a lot of money if you are a novice. What is the voltage of a “dead” 12-volt battery is different from what is the maximum charging voltage of a 12-volt battery—11.9 and 13.2 are numbers you want to watch out for in the future. Understanding at what point it is in a charge cycle is important when determining what the voltage should be.
My battery voltage reads 12.7 volts stationary but when i try to start the vehicle it does want to turn over… I tried it with a new battery that reads 12.5 volts and it starts effortless. 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.
How Many Volts Does A Car Battery Need To Start? You can read about it in this article https://tontio.com/car-battery/car-battery-life-and-maintenance/, HI, How does it work that a car battery is full at 12.6 but only 50% charged at 12.1 ? Takes about 30 seconds to test a battery and I’ll check the cars and mower several or more times a year. As mentioned above cold weather needs to be considered as this will decrease the voltage and increase the amount of power to turn over a cold engine.
But once I go used to it I trust it more than my cheap load tester.
The table below shows the voltage and approximate state of charge for each type of battery.
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