I don't think I need to say anything more. You've done it all for me.
You are learning. Keep your mouth shut and you won't appear so ignorant.
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Hybrids have taken a bad rap for their battery packs – with claims (usually made by people with a political axe to grind) that the disposal of batteries makes a hybrid a bad environmental choice, and that the battery packs must be replaced at huge expense every year or two. It turns out that at least the latter claim is completely false. Out of 750,000 Prius battery packs produced and distributed so far, only 306 have been replaced as worn-out or a warranty fault. “The life of the battery pack is generally about the same as the life of the vehicle,” said Toyota’s Jeremiah Shown.