12V battery maintenance for dummies when gone for weeks

Discussion in 'Gen 5 Prius Care, Maintenance and Troubleshooting' started by Girl__wonder, Jan 4, 2026.

  1. VelvetFoot

    VelvetFoot Active Member

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    Nice battery.

    I put a bluetooth battery monitor and a NOCO 1 under the battery cover.
    I love that battery monitor-a nice little toy. It uses very little juice. Thanks again @Gokhan !

    A flat extension cord for the NOCO easily fits under the weather stripping, as I've seen for myself and at least one other can attest to as well.
    I bought the charger just from reading the forum, lol. My plan is to not ever use it, since I do like to drive my nice sporty car!

    upload_2026-2-11_7-43-17.png
     
  2. Mendel Leisk

    Mendel Leisk MMX GEN III

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    You can connect a permanent wire either location, hatch or engine bay. The latter may be more convenient, especially for on-board style chargers, where what comes out of the car is the charger’s power cord.

    My charger is exterior style, mounted on the wall in our garage, and still works well with the (CTEK) quick connect. It’s secure garage parked though; if you’re in a carport or driveway, it’s somewhat insecure.
     
  3. VelvetFoot

    VelvetFoot Active Member

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    I like onboard chargers.

    I've got the entire charger under that battery cover. Just have to run a 120V extension cord to it and plug it in.

    Installing it under the hood didn't seem intuitively obvious to me on my Gen5. An onboard charger would receive more exposure to the elements under the hood, even if one could find a nice place for it, cleverly install the charging cables permanently to the fusebox, potential voltage droop to the battery, etc.

    Whatever, it was quite easy in the hatch.
     
  4. Mendel Leisk

    Mendel Leisk MMX GEN III

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    I’d prefer under the hood, doubly so for onboard style, for the convenience of having a secure/locked car, power cord coming out through grill. Appreciate motorized grill may complicate this, but there’s always a way.
     
  5. VelvetFoot

    VelvetFoot Active Member

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    As I said, flat extension cord fits easily under hatch weatherstripping on a GEN5.
    No complicated cord fabrication routing and mounting issues and potential future wear issues.

    To each his own, I suppose.

    Either way, you still have to remember to unplug. :)
     
  6. Mendel Leisk

    Mendel Leisk MMX GEN III

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    And/or prep for the time you forget. Secure the unit’s power cord solidly on the car side (so it doesn’t end up dragging along the road), secure the extension cord (I loop ours round a barbecue leg), use an extension cord style where it pull straight out to disconnect (not 90 degrees), and pulls out easily.
     
  7. VelvetFoot

    VelvetFoot Active Member

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