2020 Prime - died!

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by DicCarlson, Dec 23, 2025.

Tags:
  1. DicCarlson

    DicCarlson New Member

    Joined:
    Dec 23, 2025
    1
    0
    0
    Location:
    North River, NY
    Vehicle:
    2020 Prius Prime
    Model:
    Plug-in Base
    Car was plugged in to charge the traction battery. I went out to start the car while it was plugged in and went back about 15 minutes later to shut it off. Well, it was off and wouldn't start - 12V battery dead! Jump started and it ran fine and still starts a day later.
    What happened here??
     
    #1 DicCarlson, Dec 23, 2025
  2. Groovekin

    Groovekin Junior Member

    Joined:
    Nov 4, 2014
    1
    0
    0
    Location:
    Denver
    Vehicle:
    2011 Prius
    Model:
    Two
    Same issue. Had it plugged in for a long time which someone said can drain the 12volt. Had auto store test battery and said it was bad.
    I assume there's an alternator for charging it but not sure and I also thought there was a way to force the ICE to run to test it but couldn't find it. Charge will hold after trickle charge for a day or two. Maybe 5 years on the battery is not too bad??
     
    #2 Groovekin, Dec 23, 2025
  3. David Lopez

    David Lopez New Member

    Joined:
    Jan 3, 2026
    4
    1
    0
    Location:
    85143
    Vehicle:
    2026 Prius Plug-in
    Model:
    Plug-in Base
    My battery died the same way, found out it was something I left plugged into the fuse box. The battery could just be old or a dud.
     
    #3 David Lopez, Jan 7, 2026 at 12:33 AM
(You must log in or sign up to post here.)