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Prius Low 12 Volt Battery Warning

If you own a Prius, you may have received a low 12 volt battery warning. This warning is given when the voltage of the 12 volt battery drops below 10.5 volts. If you receive this warning, it is important to take action immediately to avoid damaging your battery or having your car fail to start.

If you own a Prius, you may have noticed a warning light on the dash that says “low 12 volt battery.” This is not referring to the main hybrid battery, but to a separate, smaller battery located under the hood. This battery provides power to accessories like the radio and headlights when the engine is turned off.

It’s also used to store energy from regenerative braking. over time, it can become depleted and will need to be replaced. If you see this warning light, it’s important to take your Prius to a dealer or qualified technician as soon as possible.

They will be able to test the battery and replace it if necessary.

Prius Low 12 Volt Battery Warning


How Do You Start a Prius With a Low 12 Volt Battery?

If your Prius has a low 12 volt battery, there are a few things you can do to start it. First, try charging the battery with a charger designed for lead acid batteries. If that doesn’t work, you can try jump starting the Prius with another car.

Finally, if all else fails, you can call a tow truck and have the Prius towed to a nearby service station.

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

If your Prius 12V battery is bad, there are a few things you can look for to be sure. The first thing you’ll want to do is check the voltage of the battery. If it’s below 12 volts, then it’s likely that the battery is bad.

You can also check the specific gravity of the battery acid – if it’s low, then that’s another indication that the battery is no good. Finally, if your Prius isn’t starting as easily as it used to or if the lights are dimming when you start it up, those could both be signs that your 12V battery is on its way out.

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What Does is Mean When a 12V Battery is Low?

A 12V battery is considered low when it is below 10.5 volts. This can happen for a variety of reasons, but typically it is due to over-discharging or sulfation. When a battery is over-discharged, the chemical reaction inside the battery reverses and starts producing hydrogen gas instead of electricity.

This process damages the lead plates inside the battery, making them less effective at storing and releasing energy. Sulfation occurs when the lead plates are exposed to too much sulfuric acid, which can happen if the battery isn’t used regularly or if it sits in a discharged state for too long. Sulfation prevents the lead plates from being able to store and release energy properly, which results in a lower voltage output from the battery.

How Much Does It Cost to Replace 12V Battery in Prius?

Assuming you need to replace the 12V battery in your Prius, it will cost you about $300. The 12V battery is located under the hood, so you will need to open the hood and locate the battery. Once you have found the battery, disconnect the negative and positive terminals.

You can then remove the old battery and install the new one. Be sure to reconnect the terminals before closing the hood.

Toyota Prius -Tip on how to start it with a dead 12V battery without JumpStart

Prius Low 12V Battery – Symptoms

If you own a Prius, you may have experienced a problem with the 12V battery. The symptoms of this problem can include the following:

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-The car will not start

-The car will not charge the 12V battery -The car will not run any accessories (e.g. lights, radio, etc.) when the engine is off If you experience any of these symptoms, it’s likely that your Prius needs a new 12V battery.


If you own a Prius, you may have received a low 12 volt battery warning. This is because the battery is not designed to last forever and will eventually need to be replaced. The good news is that you can replace the battery yourself, and it is not very expensive.

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