# Question: What Is A Good Reading On A 12 Volt Battery?

## How do I know if my deep cycle battery is good?

You can test your deep cycle battery’s charge level in several ways.

The most common methods use a multimeter, voltmeter, or watt meter.

When you decide to test with a voltmeter, we recommend using a digital meter rather than an analogue meter as it will be more accurate in measuring millivolt differences..

## 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.

## Can you overcharge a deep cycle battery?

Both overcharging and undercharging will have serious adverse effects on the lifespan of a deep cycle battery. In particular, you can seriously shorten the lifespan of a battery if it is used in a deep cycle application that it was not designed for.

## 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.

## At what voltage is a 12 volt battery considered dead?

12.0 voltsResting 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.

## 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.

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

12-24 hoursYes, 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.

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

Measuring Static Voltage 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.

## How do you restore a 12 volt battery?

Mix ¼ Epsom salt with ¾ warm distilled water. You need a quart of this mixture for one cell. Pour the mixture into the cells and shake it around before letting it sit. Connect the charger for the battery and charge for 12 hours.

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

So a 12volt battery will measure at about 12.9 volts when it’s fully charged and about 11.4 volts when it is fully discharged. That’s a total of 1.5 volts that represents the full range of charge on a 12volt battery.

## What voltage should a 12 volt deep cycle battery read?

12.7 voltsVoltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery.

## How do I know if my 12 volt battery charger is working?

Running a test on your battery charger is an easy process.Plug in your charger to an electrical outlet. … Turn on your voltmeter unit. … Take a battery or battery pack that’s compatible to your battery charger. … Check the readout on the voltmeter and see where the pointer is indicating to.More items…

## How many volts should a deep cycle battery have?

Charging – Flooded Types Deep Cycle Batteries in a cycling application require a recharging voltage of 2.43 to 2.45 volts per cell.

## How do I know if my 12 volt battery is bad?

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.