I heard that the battery for Prius or other hybrid car only lasts about 100,000 miles and will cost $3k to 5k to replace. Is this true? I'm thinking about getting a used one to go on car pool lane but not sure whether the extra cost would justify may be 25 to 45 minute saving per day. If it's still good idea to get a used one, how would you recommend to get one? I don't really trust craigs list for some reason. Thank you in advance.