My 2006 prius will not start without a jump to the battery. My sister took it to the dealer to have it charged. Did it again she complanes that she needs to hold down the start button longer than usuale to make it start. I had to jummp start it one more time after the dealer charged it. I put it on my $80 battery charger it did not show any problems with the battery. The battery voltage is 13.5. After I charged it it still had a problem once. She could not start it at a parking lot then came back 10 min later and it started. The car is 2006 could it just be a worn out battery? -- Even though it appears to hold a charge.