Do I need to disconnect 12v battery?

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by travbug, Nov 26, 2016.

  1. travbug

    travbug Junior Member

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    I have a gen 2 Prius (2008) and always disconnect the 12v battery when I am not going to use the car for a month or more. I didn't do this once when I was away for three months, and had to replace the 12v battery because it was completely drained and would not hold a charge. My question is, do I need to do the same for a Prius C (2014 and newer)?
     
  2. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    The C battery is not larger than the Gen 2 battery. I would continue to disconnect. If you want to do it right: amazon.com/dp/B015FN2YQY
     
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  3. travbug

    travbug Junior Member

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    Thanks for the quick reply, Jimbo. On my gen 2, I just disconnect the hot lead from the fuse/relay panel under the hood. Is there a similar setup in the C? If I do need to install the cutoff switch, where should it be located - at the battery site?
     
  4. Mendel Leisk

    Mendel Leisk Underfoot

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    If this is a once-in-a-blue-moon thing, and urgent, I would just pull the clamp off the negative battery post and isolate it.
     
  5. bisco

    bisco cookie crumbler

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    is the c battery difficult to get to?
     
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  6. w2kpugsly

    w2kpugsly Junior Member

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    Its not hard but is a pain in the @ss. As the Prius c battery is under the rear seat passenger side
     
  7. travbug

    travbug Junior Member

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    Does removing the right trim panel allow enough space for disconnecting the negative cable or does the entire seat have to come off?
     
  8. bisco

    bisco cookie crumbler

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    that's what i thought. if i had to do it regularly, i would add a connector.
     
  9. w2kpugsly

    w2kpugsly Junior Member

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    Yes there is enough space.
     
  10. Mendel Leisk

    Mendel Leisk Underfoot

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    What I would do is hook up a smart charger, one that can be left on indefinitely.

    Our car typically sits idle a day, sometimes two or three. Parasitic draw starts to take a toll; I hook up a CTEK 4.3 maybe every couple of weeks.

    (This presumes you've got secure parking and a 120 volt plug-in.)
     
    #10 Mendel Leisk, Nov 28, 2016
    Last edited: Nov 28, 2016
  11. travbug

    travbug Junior Member

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    That's what JimboPalmer suggested in post #2. Any ideas on where that connector would be placed and how it would be installed?
     
  12. bisco

    bisco cookie crumbler

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    firstly, i think they added the jump point under the hood on the c by 2014, so start there. if not, i would run the negative cable to the hatch area, and use that item jumbo recommended, then back to ground. i think they alight also make quick disconnects, but not sure.
     
  13. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    I know the Gen 2 and V and will assume the C is similar.
    [​IMG]
    All sorts of connections are made off the positive Post of the battery but the negative Post just goes to the frame. If you hook the frame end to the Switch and add another small cable between the switch and the frame, you can isolate the battery.
    amazon.com/Arnold-16-Inch-Battery-Cable-Set/dp/B003RCJB62

    I hope that helps. (The image I found does not show where the negative cable connects to the frame)
     
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  14. Mendel Leisk

    Mendel Leisk Underfoot

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    Looks like the neg. cable is grounded right down at the battery base. Might be an isolator switch could work there, with some mod of the back seat base. One of these:

    upload_2016-11-28_14-33-25.png

    Maybe just inboard the battery there'd be more space. That battery location seems better for an isolator switch than the 2nd/3rd gen Prius with battery at the back/right corner under hatch floor.
     
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