Why is 12 V replacement battery so expensive?

Discussion in 'Gen 3 Prius Main Forum' started by leea, Jul 20, 2020.

  1. tvpierce

    tvpierce Senior Member

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    Advance Auto gives a $5 or $10 (can't remember which) store credit for any battery you bring in -- whether you bought it there or not.
     
  2. tvpierce

    tvpierce Senior Member

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    I got this Bosch battery at Pep Boys:

    $195 for the battery, minus 25% online discount (order online, pick up in store 30 mins later -- although some stores may have to order it), then there was a mail-in rebate for a $40 pre-paid Visa card (not store credit, a $40 debit card that can be used anywhere)... not sure if that rebate is still active.

    $106 plus tax for a quality 4 year replacement battery is pretty hard to beat. They'll even install it for free -- although I didn't take advantage of that because the original battery was still servicable, so I kept it to use in my boat.
     
  3. Ed Beaty

    Ed Beaty Active Member

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    I got the very same one. It's properly vented for Prius (at either end, the opposite end has a plug) and comes with an elbow for the vent tube. Only issue I had with it was that the negative post was a bit too small for the clamp in the Prius. Easily rectified with a small shim and some dielectric grease.
     
  4. sam spade 2

    sam spade 2 Senior Member

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    You are right.
    It depends on how it is DELIVERED, not how it is ordered.
    But even getting it from a dealer, you still can't trust that it will be fully charged.

    Dielectric grease is an INSULATOR.....that is intended to be put on the OUTSIDE of connections.......
    not IN the connection.
    But don't take my word for it. Look it up.
     
    #24 sam spade 2, Jul 22, 2020
    Last edited by a moderator: Aug 1, 2020 at 6:34 AM
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  5. MelonPrius

    MelonPrius Active Member

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    I bought my replacement battery from Pep Boys around a month ago. I shopped around and didn't see anything that came close to your price. That would have been terrible timing if I just missed your $106 deal. I spent a total of $258 (including tax) for an Optima Yellow Top with free install at Pep Boys.
     
  6. leea

    leea Junior Member

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    I went to Pep Boys online and I do see a 25% discount for online and pickup in store. Unfortunately I don't have a store within 75 miles of me so driving that far kills the discount.
     
  7. Chris_Prius

    Chris_Prius New Member

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    I just bought my first prius (2015 with 83,000 miles). It's the original battery. Do you think it would be good to replace it since it is now 5yrs old. Is this what you do normally? Or, is the battery starting to show its age?
    Thanks,
    Chris
     
  8. leea

    leea Junior Member

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    My battery is 7 years old and I don't plan to replace it quite yet. First thing in the morning it reads 12.68 V so I think it may have life left. I will have to measure it again when it gets 20 below zero and see if I still feel the same. I understand it is not good when it fails.
     
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  9. Chris_Prius

    Chris_Prius New Member

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    Thanks, Lee. Being a newbie, there's still some anxiety about both prius batteries with plans to travel in the next few weeks.
     
  10. bisco

    bisco cookie crumbler

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    many recommend changing it every 4-5 years. others wait for signs of failure. some keep a jump pack in the car.

    12.68 is pretty strong, take it for a free load test.
     
    #30 bisco, Jul 31, 2020 at 9:45 PM
    Last edited by a moderator: Aug 1, 2020 at 6:34 AM
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  11. Chris_Prius

    Chris_Prius New Member

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    Thanks! I do have a pair of jumpers in the back.
     
  12. Majafamily

    Majafamily Junior Member

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    Mine seems to be perfect and has about 65k miles. While there is no issue, 5 years is starting to get old. I'd rather replace before it fails just to be safe! I'd really not have my wife stranded either. Lordy. I'd never hear the end of it!
     
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  13. leea

    leea Junior Member

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    I am not a battery expert but in my opinion a load test is more applicable to a battery that has to have CCA for starting. I doubt it would give me a definitive answer. I am not sure but I suspect that the battery is closer to a deep cycle than a starting type. A charge discharge test is better for those.
     
  14. bisco

    bisco cookie crumbler

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    the prius battery can measure fine with no load, and then drop way down under load. while it doesn't need to crank a starter, if the voltage drops below the computer rquirements when you press the go button, you can have issues.
    while it's not a huge load, it's a small battery trying to fire up computers and close relays.

    i'm no expert either.
     
  15. bisco

    bisco cookie crumbler

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    if you ever have to jump it, be extremely careful not to cross pollinize the wires. you can fry the inverter to the tune of $5,000.
     
  16. sam spade 2

    sam spade 2 Senior Member

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    A discharge test won't tell you how "good" it is.....unless it is done several times in a row.
    But it will tell you if it is BAD.
    One that fails a load test is not to be trusted.
     
  17. Mendel Leisk

    Mendel Leisk Senior Member

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    Another non-expert opinion:

    While Prius doesn't use the battery for cranking, the electronic load test (testing cold cranking amps) still is a good indicator of battery health.
     
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  18. sam spade 2

    sam spade 2 Senior Member

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    Yes. That's what I was trying to say !!
     
  19. leea

    leea Junior Member

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    You may not care but I decided to do some testing on my 7 year old battery.
    Before the first use of the day - 12.7 V
    Approach with key fob - 12.5
    Open door - 11.8
    A few second recovery - 12.29
    Get in close door - 12.44
    Press start radio on - 12.35
    Press start second time - 12.09
    After few seconds fan comes on - 11.98
    Start car - 14.4
    Turn off car - 12.6 or back to starting position

    I am reevaluating, I am thinking I better not wait until 20 below but check it at freezing to see how bad it is. My guess is I won't chance it through the winter. However in winter the fan won't come on until the engine is warm so I won't have that loss but I will have the loss of the dome light and what ever else it does to get prepared which was the worst drop. It and the fan were the worst. The drop to start the electronics wasn't that bad.
     
  20. Mendel Leisk

    Mendel Leisk Senior Member

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    This gamut of voltages reflect the problem with this measurement. Electronic load test of CCA will return roughly the same value, regardless of volts.

    That said, 7 years is good run, might be time.
     
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