Can you charge battery without disconnecting from car?

Yes, it is possible to charge a car battery without disconnecting it from the car. Most modern vehicles have built-in charging systems that can charge the battery while the engine is running. Additionally, some external battery chargers can be used to charge the battery while it is still connected to the car. However, there are a few important safety considerations to keep in mind when charging the battery without disconnecting it.

Make sure the charger you are using is compatible with the type of battery in your vehicle. Different types of batteries require different charging voltages and currents. Using an incompatible charger can damage the battery.

Connect the charger terminals to the battery terminals correctly. Reverse polarity (connecting the positive terminal of the charger to the negative terminal of the battery, or vice versa) can cause damage to the battery, the charger, or both.

Start the car and let it run for a few minutes before connecting the charger. This will help to equalise the voltage between the battery and the charger, and reduce the risk of damage to the charger.

Once the charger is connected, monitor the voltage and temperature of the battery. If the voltage exceeds 15 volts or the temperature exceeds 125 degrees Fahrenheit, stop charging and disconnect the charger.

Do not leave the charger connected to the battery for more than 24 hours. Over-charging can damage the battery.

If you are not comfortable with electrical work, it is best to have the battery charged by a qualified mechanic.

Here are some steps on how to charge a car battery without disconnecting it from the car:

1. Turn off the car's engine and accessories.

2. Open the hood of the car.

3. Locate the battery. The battery is usually located in the engine bay, near the front of the car.

4. Identify the battery terminals. The positive terminal is usually marked with a "+" symbol, while the negative terminal is usually marked with a "-" symbol.

5. Connect the charger terminals to the battery terminals. Make sure to connect the positive terminal of the charger to the positive terminal of the battery, and the negative terminal of the charger to the negative terminal of the battery.

6. Start the car and let it run for a few minutes. This will help to equalise the voltage between the battery and the charger.

7. Turn off the car's engine and accessories.

8. Disconnect the charger terminals from the battery terminals.

9. Close the hood of the car.

The battery should now be charged.