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I'll have to watch the video again, I don't remember a constant chime except for when I'm in reverse. That happens no matter if you are in electric or hybrid mode.
Using EV mode doesn't discharge the battery any more than normal driving will. The computer management system for the Prius is incredibly strict. This strictness is what gives the Prius such incredible battery pack life (less then half a percent have been replaced last I read). One guy on CMPG ran his 1st gen Prius to 350k miles before he got t-boned and the car was totaled. He was still using the original pack. They definitely do not need to be replaced @ 100k miles. The warranty on them is for 100k miles.
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