Why does my 2002 Prius only start when jumpstarted?

Toyota Passenger and Sports Car Forums Prius
21

@Flint
Charge the battery first and test it again. If it’s still bad, you’ll know for sure. After that, you might need to check for a parasitic draw. There are plenty of YouTube tutorials on that.

22

Ridge said:
@Flint
Charge the battery first and test it again. If it’s still bad, you’ll know for sure. After that, you might need to check for a parasitic draw. There are plenty of YouTube tutorials on that.

That’s a good plan. Just got the battery tested and it’s definitely bad. I’ll swap it and update once done.

23

Probably a bad load test on that 12V. Check the date and voltage. Batteries can sometimes show good voltage but still fail under load.