2004 Prius 12V Battery

In 2004, Toyota released the Prius with a 12 volt battery. This was a big change from the previous model, which had a 6 volt battery. The new 12 volt battery allowed for more power and longer life.

However, it also caused some problems.

If you own a 2004 Prius, chances are you’re familiar with the 12V battery. This battery powers the onboard computer and various electrical components when the engine is off. Over time, the 12V battery can lose its charge and need to be replaced.

If you’re experiencing problems with your 12V battery, here are a few tips to help you get it back up and running: 1. Check the connection between the 12V battery and the main battery. Make sure that both batteries are properly connected and there is no corrosion on the terminals.

2. Try charging the 12V battery with a trickle charger overnight. This will help to restore any lost charge. 3. If your 12V battery is more than three years old, it’s probably time for a replacement.

Batteries typically last around three to five years, so if yours is on the older side, it may not hold a charge as well as it used to.

2nd Gen Prius 12V Battery Installation Step by Step Tutorial

2004 Prius 12V Battery Location

If you own a 2004 Toyota Prius, you may be wondering where the 12V battery is located. This battery powers the vehicle’s accessories when the engine is not running. Here is a quick guide to help you find it.

The 12V battery in a 2004 Toyota Prius is located under the hood, on the driver’s side. It is mounted behind the headlight assembly and in front of the windshield wiper fluid reservoir. To access it, you will need to remove the plastic cover that is held in place by two screws.

Once this cover is removed, you should see the battery clearly.

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2004 Prius 12V Battery

Credit: axleaddict.com

What Kind of 12V Battery Does a Prius Use?

Toyota Prius models use a 12-volt lead-acid battery for starting, lighting and ignition (SLI). It’s located under the hood, in front of the left wheel. The SLI battery provides electrical current to power the starter motor, engine control computer and other electronic accessories when the car is turned off.

When the engine is running, the alternator recharges the SLI battery.

What Kind of Battery Does a 2004 Prius Take?

The 2004 Toyota Prius comes with a 72-volt battery pack that consists of 28 1.2-volt batteries. These batteries are made up of nickel-metal hydride cells, which are different from the lead-acid batteries found in most other cars. The advantage of using this type of battery is that it’s much lighter and more compact than a lead-acid battery, which makes it ideal for use in a hybrid vehicle.

Where is the 12V Battery in a 2004 Prius?

The 12V battery in a 2004 Prius is located under the hood, on the driver’s side. It is mounted in the engine compartment and is connected to the negative terminal of the battery.

How Do I Know If My Prius 12V Battery is Bad?

This is a question that we get a lot at our shop. The Toyota Prius has two battery packs, a high voltage battery for powering the electric motor and a 12 volt battery for running the lights and accessories. The 12 volt battery is similar to the one in your car, it just has a different voltage.

Both batteries are located under the rear hatch in thePrius.

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The first thing to do if you think your 12 volt battery may be bad is to check the voltage with a multimeter. The12 volt battery should have a resting voltage of around 12.6 volts.

If it is below 12 volts, thenthe battery may be bad and needs to be replaced. Another way to tell if the12 volt battery in your Prius is bad is by starting up the car and seeing how long it takes forthe electric motor to start kicking in. If it takes longer than usual or doesn’t start at all, thenit’s likely that the 12 volt battery is too weak to power up the electric motor properly.

If you’re still not sure whether or not your Prius’12 volt battery is bad, then bring it into ashop and have us take a look at it for you!


The 2004 Toyota Prius comes equipped with a 12-volt battery. This battery powers the car’s lights, radio, and other accessories. Over time, the battery may lose its charge and needs to be replaced.

Replacing the battery is a simple process that can be done at home with a few tools.

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