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

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## Is 14.7 volts too high?

Charging voltages over 14.7 volts can prematurely dry the battery by boiling out electrolyte, and increase risk of a battery hydrogen gas explosion. … Less than 14.3 would be a “weak” alternator or regulator. Much less than 14.2 at a fast idle is bad wiring, bad alternator or regulator, or a bad connection or fuse link.

## Is 15 volts too high?

Higher than 15 volts indicates a fault in the charging system’s voltage regulator or related circuits. If it’s substantially excessive, this can cause electrical system and/or battery damage. You mentioned your voltmeter runs at about 15 volts most of the time.

## What car battery voltage is too high?

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.

## Is 16 volts too high?

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. 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.

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## Is 13.5 volts good for a car battery?

If the voltage stays about a volt higher than resting voltage (e.g., about 13.5V), then the car’s charging system is functioning. But if the voltage drops (or increases) dramatically at any point, there’s a problem in the alternator or the voltage regulator.

## Is 14.8 volts too high?

14.8V is considered overcharging. A bad regulator over charging would most like shoot upwards of 16.0V. State of charge, temperature, age of batteries all have an effect on the charging rate. If it’s cold out and you ran the batteries down some then it will be higher than normal.

## 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. … It will increase in power with increasing voltage.

## Is 14.5 volts overcharging?

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.

## How do I know if my car battery is overcharging?

Use A Multimeter

When the vehicle is started, without the introduction of a load (the lights or air conditioner), the volts will usually rise to an average of 14 volts. If the multimeter reads at more than 14.8 volts, then this can be considered as overcharging.

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## Can a car battery explode if overcharged?

A battery can quite simply die from being overcharged. … A small electrical spark can ignite the gas and cause the battery to explode, sending plastic and lead shrapnel flying around, in addition to a caustic sulfuric acid spray. Obviously, this is the most dangerous side-effect of an overcharged battery.

## What happens if battery voltage is too high?

Voltage will become dangerously high. The battery can overcharge which will leave it useless. Engine components that aren’t designed to handle the pressure, temperature or power will be damaged. The alternator isn’t designed to handle excessive power and eventually it will burn out.