The hybrids Toyota has made since 2004 should never need a replacement hybrid battery. The earlier hybrids, up to 2003, used a less rugged battery that had a noticeably higher failure rate after 200K miles. My 2002 Prius has 144K miles and no sign of battery weakness while my wife's 2002 Prius has 110K miles, also with the battery going strong. Your battery should do much better.
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