how much should a fully charged car battery read?
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Car Battery Voltage A fully charged battery should read 12.6 volts or above. When the engine is running, that number should be between 13.7 and 14.7 volts.
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A fully charged battery will typically display a voltmeter reading of about 12.6 to 12.8 volts. If your voltmeter is showing a voltage anywhere between 12.4 and 12.8, that means your battery is in good shape. Any voltage above 12.9 volts is a good indicator that your battery has excessive voltage.
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A typical electric car (60kWh battery) takes just under 8 hours to charge from empty-to-full with a 7kW charging point. Most drivers top up charge rather than waiting for their battery to recharge from empty-to-full. For many electric cars, you can add up to 100 miles of range in ~35 minutes with a 50kW rapid charger.
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Connect the multimeter to the positive and negative battery terminals. If you don't have a voltage of around 12.6 volts, you may have a bad battery. Now start the car, and look for a revised voltage over 10. If your voltage drops below 5 when the car is running, it is bad and should be replaced right away.
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["Prepare Your Multimeter. Set your multimeter to voltage and ensure it's adjusted to 20 DC volts.", 'Touch the Probes to Your Battery Terminals. Press each probe to the correct terminal, touching negative to negative and positive to positive. ... ', 'Turn on the Headlights. ... ', 'Check the reading.']
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Battery Voltage The standard automotive battery in today's vehicles is a 12-volt battery. Each battery has six cells, each with 2.1 volts at full charge. A car battery is considered fully charged at 12.6 volts or higher.
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When the battery is not being charged and not delivering charge to a load, this is the rule of thumb. For a 12 volt, leadacid battery, the voltage measured between these two points should be between 11 and 13 volts. The closer the voltage is to 13 volts, the closer the battery is to being fully charged.
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Thanks for the question. The battery should maintain between 10 and 12.5 volts after a night of not being used. It should have about 10 volts to start the vehicle. Less than that it's likely the engine will not start.
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For others, it's normal to see as high as 16 volts for long stretches. Still, it's perfectly normal for others to see the alternator not charge at all intermittently. ... For some alternators, it's normal to see as low as 13 volts. For some, a constant 13.6 volts is an indication of a problem.
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Observe the voltage readout on the meter. This indicates the charge of your battery. Should you see a reading of at least 12.6 volts, then your battery is fully charged. Any number lower than 12.6, however, indicates a battery that is not holding a full charge.
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A 12 volt NOMINAL voltage battery should read 12.5 at full charge if it reads 12 it is about 25% charged. This can be enough to start it depending on the age, size of the battery and how much cranking the car needs.
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Firstly, it is important to test the voltage output of your vehicle's alternator to see whether you in fact need a DC – DC charger. If your vehicle is producing > 13.7-13.8 Volts then the majority of the time purchasing a DC – DC charger would in fact limit your charge rate to the second battery.
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['Measure the no load voltage of the battery by connecting directly to the leads fo the multimeter. ... ', 'Connect a 4.7 ohms 5W resistor across the battery and quickly measure the voltage drop across the resistor. ... ', 'Calculate the battery internal resistance.', 'Calculate the maximum current it can deliver.']
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Typically, the larger the battery, the higher the amp rating. The internal chemistry of the battery will also affect the amp rating. Most car batteries have a capacity between 550 and 1000 amperes.
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A car battery generally holds 48 amps, so it will take about 12 hours to reach a full charge using this voltage. This could be a good choice for charging your car battery to maintain a certain level for a long period of time.
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Car batteries range from 40AH to 110AH, and alternators range from 45 amps to 200 amps. If you are using a battery charger, a 10 amp charger will take 4 to 11 hours to fully charge the battery, a 2 amp charger will take 2-4 days.
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A reading of 12.65-12.77 volts means your battery has a full charge. 12.45-12.54 volts means you have a 75% charge, 12.24-12.29 is 50% charged, and 11.99-12.06 volts is 25% charged. 11.75-11.89 volts means your battery is dead.