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Installation kit for installing Optima battery in 2001 - 2003 Or 2004 and newer if you have a D51 battery you want to install or must have American size electrical posts.

Availability: Usually ships the same business day

Prius-Optima KIT  US$20.00  Year: 


We also now have the direct replacement battery for the Prius 2004 + in stock! It does not need this kit! It also includes instructions. If you want to use American style connectors for some reason than order this kit.
Since you have to pay shipping on the kit if ordered separately it is usually cheaper to order everything from us!
For battery + kit for 2001 to 2003 Prius click here!
For Lexus hybrid CT200h You do not need this kit. Click here for a battery.
For Camry Hybrid Click here!For Toyota Avalon Hybrid, Nissan Altima Hybrid 2007 You do not need this kit. Click here for a battery.
For a Toyota Highlander Hybrid (particularly 2011+ where battery is in the trunk), Lexus hybrid 600HL, GS450H and RX450H. You do not need this kit. Click here for a battery.

This part kit includes:
  • A positive connector (custom made for us)
  • A Negative connector with cable. (custom made for us)

    You need this kit to install the Optima battery in a Toyota Prius 2000, 2001, 2002, 2003, because the North American and Australian Prius comes with connectors for Japanese electrical posts. The kit replaces the connectors. (However, for the 2004+ Prius you can now use a direct replacement battery and do no need this kit.) The kit will not work for a Prius made for Japan they appear to have been made with American electrical post connectors.

    In the 2000 to 2003 you have to modify the battery bracket. However, it is easy to do and we provide instructions. Also you should be aware that there is less space around the battery in the 2000 to 2003 Prius and we have not crash tested this installation.

    With this kit you can replace your Prius 2001, 2002, 2003, battery with a longer lasting battery.

    You can keep the original Toyota battery connectors so if you or a future owner of the car should ever want to go back to a battery with Japanese electrical posts you can.

    Join over 800 other Prius owners who have used this kit!

    The Federal Magnuson-Moss Warranty Act of 1975 prohibits a manufacture from curtailing warranty coverage due to after-market parts unless it can be demonstrated that they caused the problem.

    Tools needed:

    • flat screw driver
    • 10mm wrench or 10mm deep socket
    • 10mm socket
    • 12mm wrench or socket
    • 1/2 inch wrench or 1/2 inch deep socket (13mm will do)
    • vise, large crescent wrench or vice grips
    • small crescent wrench or pliers
    • tape
    • hammer or rubber mallet


    The positive connector has to connect with the battery and the Toyota fuse assembly. We had it custom made! You also will not find the vent connectors in an auto parts store.

    We have written and rewritten the instructions to make it easy for most people however if you have no desire to work on electrical parts you may want to buy the kit and have your battery professionally installed.

    At least three users have told me that their 2001-2003 Prius now gets better mileage with the new battery. One customer with a 2004 also reported this. One classic owner told me that getting a new battery restored his mileage back to the original mileage he was getting when the car was brand new and another classic Prius owner told me that he is now getting better mileage then he did originally. So if you 12 volt battery is weak it could also be affecting your gas mileage.

    If you are not sure about the state of your current battery we have instruction on how to test it here.

    Customer Comments regarding our 2004 to 2009 kit:

    "I placed my order on Friday afternoon, and got it delivered to Boulder, CO, on Monday. Very impressive service.

    Bottom line - I got the Optima battery installed and the car started afterwards.

    The instructions were quite clear and very helpful. Thanks for selling such a useful kit!
    "

    J. V., Boulder, Colorado






    Please Note: California Proposition 65 Warning Battery posts, and the negative terminal, contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Wash hands after handling.




    Availability: Usually ships the same business day

    Installation kit for installing Optima battery in 2001 - 2003 Or 2004 and newer if you have a D51 battery you want to install or must have American size electrical posts. Prius-Optima KIT  US$20.00  Year: 

 Toyota Prius 12 Volt Auxiliary Battery with install kit for 2004 + including Plug in
Toyota Prius 12 Volt Auxiliary Battery with install kit for 2004 + including Plug in

We recommend the direct replacement not this product.

US$210.00
Hybrid Battery Repair = Repair is cheaper!
Hybrid Battery Repair = Repair is cheaper!

Repair the Prius hybrid battery and save!

US$400.00
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Free Bumper Sticker



We usually ship your order the same day if entered by 4:30 PM. Los Angeles time Monday to Friday.   We have special shipping rates available for International orders. See our full shipping policy. International Air Mail takes about 5 to 15 days to most countries.
Service: We pack well! (no damage or problems!)  • We ship that day!  •We email you with shipping info! Our store is hosted by , and we consistently get very good , and excellent ratings from our customers.
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