# What happens if you charge a car battery backwards?

Contents

Unless the battery is nearly completely discharged, you will likely destroy your battery charger. Many battery chargers have reverse polarity protection. With reverse polarity protection nothing happens. If you did manage to reverse the battery polarity, it would in most cases spell doom for the battery.

## What happens if you charge a car battery the wrong way?

When the battery cables are hooked up with the negative to the positive and positive to the negative terminals, the battery can explode. This is true for the battery being charged and the battery in another car being used to supply the charge.

## Will charging a battery backwards ruin it?

Remember, a completely discharged battery is nothing more than an empty vessel. In order to gain a negative charge, it would then necessitate being hooked up backwards, and charged that way. … For all intents and purposes, the battery will be ruined.

## Can you charge a car battery backwards?

Charging a Battery Backwards

A battery consists of a negative and positive terminal; charging the battery backward is not possible. The cables connecting the battery to the charging source must match to charge the battery. … The voltage from the running vehicle eventually charges the dead battery.

## What happens if you connect positive to negative on a battery?

Connecting the positive terminal of each battery to the negative terminal of the other battery will result in a huge surge of electrical current between the two batteries. … The heat can melt internal and external battery parts, while the pressure from the hydrogen gas can crack the battery casing.

## Can you charge a 12 volt battery backwards?

But Can a 12-volt Battery Reverse Its Polarity? Yes, it can happen. If the battery cells are out of balance, some cells will discharge before the others. As it continues to discharge, they will start to reverse polarity.

## What happens if you hook up a 12 volt battery backwards?

The protection circuit shuts down 12 volt power to the converter/charger if you connect the battery “backwards” and even after you reconnect it properly, those fuses, being blown, won’t allow any 12 volt power from the battery to the 12 volt distribution panel until after they are replaced….

## What happens if you jumpstart a car with the cables backwards?

Fuses (and/or fusible links) act as circuit protection devices between the battery and the vehicle’s electrical system. Connecting the jumper cables backwards will often result in one or more blown fuses. The affected circuit will not function correctly until the blown fuse is replaced.

## What happens if you connect jump leads the wrong way?

Connecting jump leads the wrong way round will result in major damage to the battery and the battery is also likely to explode. If a battery explodes and you’re stood near enough you could be seriously injured including skin burns from the acid.

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## What happens if you connect a car battery negative first?

For technical functioning it does not matter in which order you connect them. However for safety reasons it does matter. The whole body of the car is usually connected to the minus pole.