# How many volts is too much for a car battery?

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If the voltage on your voltmeter is between 12.4 and 12.8, your battery is in good health. But if the voltage is more than 12.9 volts, it is a sign that your battery has excessive voltage, which can be a daunting situation for you.

## Is 15 volts too high?

So, to answer your question, Yes, 15 volts is too high. Most car alternators, that normally recharge your battery after every start, and provide power while the engine is running, are normally voltage regulated to about 13.8 to 14.0 volts.

## Is 14.7 volts too high?

The battery terminal charging voltage must be less than 14.7 volts to prevent excessive gassing. Charging voltages over 14.7 volts can prematurely dry the battery by boiling out electrolyte, and increase risk of a battery hydrogen gas explosion.

## What car battery voltage is too high?

Any voltage above 12.9 volts is a good indicator that your battery has excessive voltage. If that’s the case, turn on the high beams to drain excessive voltage surface charge. (Also, an excessive charge could mean that your alternator is to blame for an over charged battery.)

## Is 16 volts too high for a car battery?

Check to see the reading and if it is over 12.9 volts, your battery may have excessive voltage. 12.6 to 12.8 is the ideal voltage level for your battery. Anything lower than that is a completely different set of problems.

## Is 15 volts too high for an alternator?

To answer your question, yes, 15 volts is too high. Most car alternators that charge your battery after every start and provide power while the engine is running are usually regulated to between 13 and 14.0 volts.

## How do I know if my alternator is overcharging?

Symptoms of Your Car Alternator Overcharging:

1. Car Battery Voltage Gauge Reading is High. You notice a high voltage reading on your cars vehicle’s dashboard. …
2. Car Battery Gets Hot When Charging. …
4. Your Car Battery is Bulging on Sides.

## Is 14.5 volts too high for an alternator?

If the alternator is working well, your multi-meter should read somewhere in the vicinity of 14 volts (typically 13.8-14.2). If it is reading excessively higher than 14 volts (greater than 15 volts) it is possible that the voltage regulator on your alternator is faulty or going bad.

## Is 14 volts good for car battery?

This voltage range means the battery is in good condition for starting the vehicle. If the measured reading is less than 12.2 volts, the battery’s resting voltage is weak, which means it most likely needs to be charged or replaced. … With the motor running, the multimeter rating should stay in the 14 to 14.5 volt range.

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## How much voltage should an alternator put out?

A good alternator should maintain battery voltage between 13.9 and 14.8 volts (14.2 is optimum).

## Can a car battery explode if overcharged?

If the overcharging is terrible enough, the pressure can get so high that the battery explodes. Hydrogen and oxygen are a very explosive mix, and just a small spark can ignite it. An exploding battery is bad enough, but it will also spray around the immediate area.

## What battery voltage is bad?

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.

## Can a car battery have too much power?

The starter motor TAKES the amount of power it needs. The worlds largest most powerful car battery on steroids will still only GIVE the starter motor what it needs, no more. The higher capacity is just exactly that, it has more capacity to give. It cannot FORCE more power than is needed.

## Is 15 volts too high for battery?

So, to address your question, Yes, 15 volts is too high. Most car alternators, which generally recharge your battery after every start and give power while the engine is running, are voltage regulated to around 13.8 to 14.0 volts. The battery will only gas somewhat up to this voltage and at normal temperatures.

## Is 15 volts normal for a car battery?

Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. … If the lights have normal brightness and don’t change intensity as the engine is revved, your charging system is probably functioning normally.

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## Why is my car battery 17 volts?

It may be that the regulator is packing up and the alternator is going to max. unregulated output because of a bad battery output voltage (alternator input) connection between the battery and the alternator.