Sadly, this is not the case. Battery technology has come a long way, and most modern vehicles can go all night with the radio on or the dome light illuminated and still have enough juice to start the engine in the morning. This is due to the fact that the LV battery is fed, after the "Ready" mode status is enabled, via a step-down DCDC converter from the High Voltage, high capacity battery and its main purpose is to turn on the computers of the Prius. Your Prius uses the same type of 12-volt battery that other gas hogs use to start the engine. You would think with a Toyota Prius having such a massive bank of batteries, there would always be enough juice to get things going, right? The low voltage (12V) battery (LV Battery) is located in the right part of the rear boot/trunk/baggage compartment and it is of smaller dimensions and charge capacity than those found on conventional drivetrain cars. For example, it is advisable to listen to the radio for longer periods of time, by keeping the Prius in P(ark) while in Ready mode, to allow the HV battery to feed the 12V network via the DCDC converter (and if necessary start the ICE to re-charge the HV battery). Remember your friend’s CD, and open the passenger door. Prius Wiki is a FANDOM Lifestyle Community. Why does this happen? The Prius can be jumped started in case the LV battery is discharged, by connecting another 12V battery to a dedicated contact available inside the engine bay. Notes If you haven't already, check the health of your 12v battery. The Prius electrical system has some characteristics outside the realm of usual car logic that can lead to a dead battery. The answer is in the headlight controls. • As I said there, unless your car doesn't start at all it's tough to know if you need a new 12v battery in a Prius. Why did your Prius headlights come on, or stay on, for what seems to you like no logical reason? Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Since headlights were added to the front of cars and trucks, the hurried and the forgetful have been leaving them on, resulting in a dead battery and a much longer day than they may have hoped for. Those batteries that make your Prius a hybrid are commonly referred to as “traction batteries” because they serve the sole purpose of powering or being charged from your wheels through a process known as regenerative braking. If you would rather use the auto lights, just remember that an improper sequence of events at home or in the parking lot could result in your lights staying on until you return to your vehicle, hopefully not with a dead battery. But the headlights, when left on, can still be a killer. Here are some examples of how to kill the battery in a Prius: Scenario 2: The “let me just grab that CD for you.”. Another way to prevent getting this page in the future is to use Privacy Pass. Some people call this old-fashioned and aren’t happy with that solution. You would think with a Toyota Prius having such a massive bank of batteries, there would always be enough juice to get things going, right? She pulled in the driveway and left the car on. Auxiliary battery on my 2013 Prius won't stay charged 8 Answers. While most modern cars electronically turn off your headlights to avoid battery drain, in certain circumstances, some Prii (the plural for Prius) will actually turn them on. Because of the number of systems connected to the 12V network, and the smaller capacity of the 12V battery (whose main purpose is to start the computers managing the HSD) it is not advisable to use the accessory mode for long periods. But once you realize that the process of turning off a Prius and getting out can turn your routine into havoc, you’ll pay more attention. The low voltage (12V) battery (LV Battery) is located in the right part of the rear boot/trunk/baggage compartment and it is of smaller dimensions and charge capacity than those found on conventional drivetrain cars. One way to prevent a dead battery is not to use the automatic headlight feature. Toyota recommends replacing your battery every 3 years or so. Also if the battery is quite dead, the charger may refuse to provide power to the battery for safety reasons (not knowing if it is connected to a battery or not). Failed traction (HV) battery, what to do? By PriusDIY.com. I have a 2013 Prius C and had to replace the 12V Auxiliary battery at 34,856 miles, which was under the 36K miles under warranty for this battery, but over the 3 year mark (unfortunately for me the 3 yr mark, came before the 36K mile mark). If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. How To Open a C6 Corvette With a Dead Battery. Your IP: 213.215.83.4 A few nights ago, I was about to take the 05 Prius (53,400 miles) to fuel it up after my 16 years old daughter arrived home from her summer job. With the door open, turn off the car completely, while distracted by chatting with someone. This results in the dreaded dead battery and requires a jump start. Tips for Greater Enjoyment of Your Prius Hybrid, What to Do When Your Car Won't Start or Turn Over, How to Change Your Headlight Bulb in 5 Minutes, Little-Known Facts and History of the Volkswagen Touareg, Everything You Need to Know About Car Batteries, Dash Lights: The Battery Light on Your Dashboard, The Hottest New Trucks for 2017--Coming to the New York Auto Show, Hybrid Cars - The Future of 4x4 Pickup Trucks and SUVs, 10 Fuel Efficient Cars You'll Love to Drive. Turn them off manually each time you get out of the car, and then turn them back on when you return to drive. Are Prius Batteries Different? 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