# Question: What should a 12 volt battery read when fully charged?

## What is the voltage of a dead 12 volt battery?

It’s a good place to start, though. This is called the “open-cell” or “resting” voltage of the battery. Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means it’s about 50% charged.

A healthy 12 volt motorcycle battery should maintain a range from 9.5 – 10.5 volts under the load for a good 30 seconds straight. If the battery begins to hold and then steadily drops in voltage, there is a problem. If the voltage instantly drops to 0 volts, that is also a problem.

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## How many amps does a fully charged 12 volt battery have?

Most battery manufacturers recommend sizing the charger at about 25% of the battery capacity (ah = amp hour capacity). Thus, a 100 ah 12 volt battery would take about a 25 amp 12 volt charger (or less).

## What should a battery charger read when fully charged?

What should a battery charger read when fully charged. On the 12 amp charging setting, the needle will settle at around 6 amps, or just under. This is showing that the battery is fully charged. On the 2 amp setting, the needle will settle near the end of the small red triangle.

## Is 11.9 volts enough to start a car?

A flat battery can show 12 volts, but not be good enough to start a car. 11.9v indicates the battery is completely discharged. Anything under 12.2v means the battery is in a state of discharge, and a healthy battery should show 12.6v in a static state.

## How many volts should a good 12 volt battery read?

Check the reading. 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.

## How long does it take to charge a 12 volt battery?

Yes, batteries take time to recharge. It could take hours. A 12-volt battery could take up to 12-24 hours to charge fully. When recharging your battery, remember that if it gets too hot while you’re charging it, you need to stop charging.

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## How do you tell if a battery is good?

Drop each battery (with the flat, negative end down) from a couple of inches up. If the battery is charged, it should make a solid thud and most likely stay standing. If, however, the battery is dead, it will bounce and fall over immediately.

## How do you test a 12 volt battery with a multimeter?

Touch the black lead to the negative (-) terminal on the battery and the red lead to the positive (+) terminal. Note the reading on the meter. It tells you the voltage between the battery terminals. If the battery is good, the reading should actually be higher than 12 volts.

## Can you overcharge a 12 volt battery?

A 12V lead-acid battery will not be damaged by overcharge if the voltage is kept low enough to avoid electrolysis, and the charging current is kept below 0.2C (5 times less than the Ah capacity). If it can put out more current than the battery can take then the battery may overheat.

## Is it better to charge a battery at 2 amps or 10 amps?

Consequently, when trying to charge a larger battery at that rate, it will take a very long time and the battery may discharge at a greater rate than the 2amp charge can provide. It is better to charge a deep cycle battery at a higher charge rate like 6-amps, 10amps or higher.

## How long does it take to charge a 12 volt battery at 2 amps?

How Long To Charge A Car Battery At 2 Amps? It will take a lot of time to charge a car battery using a 2amp charger. The average time to charge a 48amp battery fully, using such a charger is 24 hours.

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## How do I know if my battery charger is working?

Check the readout on the voltmeter and see where the pointer is indicating to. If it’s on the left side, or negative side, switch the test probes. If it’s on the right side, it will show that the battery is receiving some charge. Where it points to on the meter will determine how much charge it received.

## What does a blinking green light mean on a battery charger?

Blinking GREEN means the charger is “balancing” the cells, so if one or more cells are defective and will NOT reach 4.2 V, then the charger will keep on trying.

## What do the lights mean on a battery charger?

The red led light indicates there is AC power to the battery charger. The yellow led light indicates the charger is charging the battery. The flashing yellow led indicates the charger is in abort mode.