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How to recharge hybrid battery

Discussion in 'Gen II Prius Technical Discussion' started by thedudeman, May 14, 2012.

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  1. thedudeman

    thedudeman New Member

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    Hello, I recently purchased a used 2007 prius. The car has not been driven for some time. I won it in an auction from a used/wreaked car lot and am in the process of fixing it up. I need to know if it is possible to charge the hybrid battery when the car is idling or will this only discharge the hybrid battery and if so, is there any way to charge the hybrid battery other than driving the car? Thank you.
  2. fjpod

    fjpod Member

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    No running the engine is the best way and only way to charge the traction battery short of taking it out of the car and bench charging it. Be mindful however, that there is also a 12 volt battery used for normal startup and accessories. If it's about 5 years old and has been dormant, it likely will need replacement. Normally the 12 volt gets charged when you just run the car.
  3. qbee42

    qbee42 My other car is a boat

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    You left out a comma: "No, running the engine..." In other words, running the engine *is* the best way.

    Tom
  4. usnavystgc

    usnavystgc Die Hard DIYer

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    I think some key info has been left out here. Running the engine in "P" will only charge the battery for about 40 seconds. If you want to "force charge" it, you will need to put the car in "D" and hold the brake while giving it gas. You will need to balance it by viewing the "Energy" screen. Power will go from the engine to the motor and to the battery. You will have to "feather" the throttle pedal to get this indication/state. Its also not easy to hold.
  5. thedudeman

    thedudeman New Member

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    Thanks everyone, so the front wheels are elevated off the ground right now. Can I just give it gas and let the wheels spin? I assume that will charge the hybrid battery the same as if the wheels were on the ground and I was pushing the break.
  6. wjtracy

    wjtracy Senior Member

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    CAUTION- spinning front tires is a problem (I think)
    I am not expert but you are touching the third rail
    the elec motor is sensitive to over spinning
    Somebody correct me if I am off base
  7. David Beale

    David Beale Senior Member

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    NO!
    The battery will charge just fine for however long it takes while in "P". DO NOT put the car in "D" while on a lift. It's dangerous!
    DO NOT try to charge in "N", it won't work.
    Use "P" and let the car do its' thing. You don't need to press the accelerator, stand on your head, face east, or anything else. Just get it in "ready" (you will see the light on the dash) and leave it alone.

    Normally the engine will shut off after about 20-40 seconds, but if the battery is discharged it will run to get some charge in it.

    Finally, there are two batteries as mentioned above. The 12V one is used to power the computer systems and is needed to get the car ready to start. It closes a relay in the hybrid battery allowing it to be used. The 200V hybrid battery or traction battery is used to actually start the engine.
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