How much does a battery cost for a hybrid, and how often do you have to change them.
No one has had to replace their hybrid car battery yet. http://www.improve-gas-mileage-guide.com/hybrid-cars.html
Sorry mate, but many HAVE had to. Well depending on what you consider failure of the battery pack. A lot of groups claim they haven't since the vehicles run on gas power almost non-stop, effectively making it a normal car, instead of not working. But in actuality the number of amp-hours the battery stores decreases with use. But the fact remains for the batteries to remain effective they do have to be replaced eventually, and it's hard to specify a price since each brand has different costs and they are continuously getting cheaper. Time frame is also hard to answer as they are continually making the batteries last longer. To prolong the batteries never fully charge or discharge. A handful of companies make many current hybrids plug-ins and decrease the life of the battery by chargeing them to a higher level allowing the car to travel at low speeds for a greater distance without resorting to gas power. Further developments have been proposed to use ultra capacitors to store energy created during regenerative braking processes, these also have the added benefit of having a much better charge efficiency than most conventional batteries. But to my knowledge these have yet to be put in any form of production vehicle. I've heard of test units and read a handful of IEEE papers on the subject but I don't think industry has taken to it.... Cost, weight, and safety likely being the largest concerns.