So you bought a hybrid, maybe a Prius like I did? Maybe it has high mileage and you think the main hybrid battery is going bad? Here are some major signs that will tell you that you need to either replace your hybrid’s battery that helps power the engine, or in my case, take it to the scrap yard :(. With 285,000 miles in the car it doesn’t make sense for me to replace the battery on such an old car......