I had previously disconnected the negative terminal of the 12V battery. I have had my 2012 Prius out of commission for a few weeks while I was replacing the head gasket. 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. The Prius has two batteries. The Gen2 Prius batteries are performing much better than the Gen1. How much does a Prius battery cost to replace? Its … For the voltage under load (when your Prius is in "Accessory" mode), anything below 12.0 volts is unacceptable, At the time of testing, when these photos were taken, I had just finished a long drive in my Prius so the battery should have been at a … I’ve seen Gen2s with 200K on the original battery. With a Prius you may experience strange things, dimming dash lights, a drop in MPG's and if the 12v is completely dead obviously no "starting." When I started the Prius, I go … read more a small one that starts the car (12v) and a large one that drives the car (230-310V depending on model). The actual R&R (remove & replace) is pretty quick. The normal battery life is four to five years. A very small 12V battery and a large high voltage traction battery. their is two batteries in a prius. What is true is that the Auxiliary 12v battery does need replacement every 3-4 years. Prius owners soon discovered that the OPTIMA D51 YELLOWTOP would fit in their cars and provide superior performance and lifespan. With a traditional car you can normally tell the 12v battery needs replacement by sluggish starts or no starting at all. Here is a battery test you can perform on a Prius battery that is easy to do. A Toyota Prius battery, by the way, contains 168 1.2-Volt nickel-metal-hydride cells, which contain a total of 1.6 kilowatt-hours of energy. The battery pack of any hybrid Toyota has a warranty of 150,000 miles or ten years in positions with California. So, how long is the battery life of Prius? The much larger traction battery actually starts up the engine when needed. but it only costs about $150. Prius battery test procedure for all Prius Cars 2001 to 2008. The traction battery is totally disconnected from the rest of the vehicle. As already mentioned by someone else, you probably just need a new 12 volt battery. Four years is a little short as far as life span goes but not unheard of. In short, if your 12 volt battery is four or five years old we recommend you replace the battery. There is NOTHING wrong with taking lots of small trips in the Prius. The gas engine runs when it needs to. The Gen1 battery packs were about $2500 (a price which will likely fluctuate) and the labor to replace them was about 3.5 hours. One the most frequently asked question about Toyota hybrid vehicles such as Prius is its expectancy. Your Prius uses the same type of 12-volt battery that other gas hogs use to start the engine. Plus the fan blows straight in to the bottom of the pack. Battery life expectancy is the average lifespan of a battery. That's pretty much what the car was designed for and where it gets the best mileage. Even though the Prius doesn't use it's 12-volt battery the way conventional gas-powered cars do, their batteries do still reach the end of their useful life and need replacing. Air Filter for Prius 2010 to 2015 - extend the life of your hybrid battery The cooling air intake is about 6 inches above the seat bench so a lot of dirt can get sucked in in when the fan is running. 12V Lithium Battery for Toyota Prius, 2003-2020 Interstate Batteries 12V 35AH Sealed Lead Acid (SLA) AGM Deep Cycle Battery (DCM0035) Insert Terminals 4.3 out of 5 stars 533 When the Prius is off or is in any "mode" other than the one you drive in (called READY mode, the other modes are: OFF, ACC, IG-ON). 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