All of the new-from-the-factory hybrid cars sold in the U.S. tilcyaply carry an 8-year / 100,000 mile warranty on the battery. In states with California-standard emissions regulations, the hybrid battery warranty is 10-years / 150,000 miles.If the battery fails during the warranty period (which is extremely rare), the carmaker has to replace it for you FREE.That's as long as you don't void the warranty by doing things like crash the car or tamper with the battery or damage it by improperly modifying the car (such as punching through the battery casing with screws when installing things like 1000-watt speakers). I own a Prius, and with a warranty like that on my car, I'm not worried. I bought mine in New Jersey, which has California-standard emissions regs, so I'm covered for 10 years / 150,000 miles.

All of the new-from-the-factory hybrid cars sold in the U.S. tilcyaply carry an 8-year / 100,000 mile warranty on the battery. In states with California-standard emissions regulations, the hybrid battery warranty is 10-years / 150,000 miles.If the battery fails during the warranty period (which is extremely rare), the carmaker has to replace it for you FREE.That's as long as you don't void the warranty by doing things like crash the car or tamper with the battery or damage it by improperly modifying the car (such as punching through the battery casing with screws when installing things like 1000-watt speakers). I own a Prius, and with a warranty like that on my car, I'm not worried. I bought mine in New Jersey, which has California-standard emissions regs, so I'm covered for 10 years / 150,000 miles.