The much larger traction battery actually starts up the engine when needed. 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." The Gen1 battery packs were about $2500 (a price which will likely fluctuate) and the labor to replace them was about 3.5 hours. The battery pack of any hybrid Toyota has a warranty of 150,000 miles or ten years in positions with California. I have had my 2012 Prius out of commission for a few weeks while I was replacing the head gasket. Prius owners soon discovered that the OPTIMA D51 YELLOWTOP would fit in their cars and provide superior performance and lifespan. 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). 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. Those batteries that make your Prius a hybrid are commonly referred to as âtraction batteriesâ because they serve the sole purpose of powering or being charged from your wheels through a process known as regenerative braking. 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. Iâve seen Gen2s with 200K on the original battery. 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 normal battery life is four to five years. 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 The actual R&R (remove & replace) is pretty quick. The traction battery is totally disconnected from the rest of the vehicle. Battery life expectancy is the average lifespan of a battery. What is true is that the Auxiliary 12v battery does need replacement every 3-4 years. A very small 12V battery and a large high voltage traction battery. Its ⦠The Gen2 Prius batteries are performing much better than the Gen1. In short, if your 12 volt battery is four or five years old we recommend you replace the battery. How much does a Prius battery cost to replace? a small one that starts the car (12v) and a large one that drives the car (230-310V depending on model). but it only costs about $150. The Prius has two batteries. With a traditional car you can normally tell the 12v battery needs replacement by sluggish starts or no starting at all. When I started the Prius, I go ⦠read more That's pretty much what the car was designed for and where it gets the best mileage. their is two batteries in a prius. As already mentioned by someone else, you probably just need a new 12 volt battery. I had previously disconnected the negative terminal of the 12V battery. Here is a battery test you can perform on a Prius battery that is easy to do. 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 ⦠Your Prius uses the same type of 12-volt battery that other gas hogs use to start the engine. One the most frequently asked question about Toyota hybrid vehicles such as Prius is its expectancy. So, how long is the battery life of Prius? There is NOTHING wrong with taking lots of small trips in the Prius. Four years is a little short as far as life span goes but not unheard of. The gas engine runs when it needs to. Prius battery test procedure for all Prius Cars 2001 to 2008. Plus the fan blows straight in to the bottom of the pack. 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