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Installtion Kit for installing Miata battery in a Prius 2001, 2002 & 2003

Availability: Usually ships the same business day

prius12vkit  US$30.00  

We now recommend the Optima battery (significantly longer lasting) for a 2001 to 2003. We suggest you just order the battery and the kit kit together!
Click here for the kit to install and Optima Battery in a Prius 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 and 2010+.

Order now and join the hundreds of other of other Prius owners how have installed kits and batteries from e Learn Aid. You will be glad you did!

You can install the battery in 30 minutes. It would take that much time for you to drive to the dealer buy a battery and come back. (Unless the dealer is very close by.)

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 the original battery you can. (Why you would want to go back to the original battery with less capacity, we do not know.)

We make it easy by preassembling everything that will make it faster for you and we provide detailed instructions with lots of data based on many installs and lots of feedback from users! (see picture)

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. (For more information click here and scroll down go to paragraphs under "Tie-In Sales" Provisions.)

This kit includes:

  • Instructions
  • New Negative battery cable.
  • New Positive battery connector (custom made)
  • Terminal Protectors for positive battery connector
  • Battery riser (custom made - it raises the battery so the top of the battery is at the same place as the original battery.)
  • New vent hoses and connectors fully assembled. (Hose and connector so you can connect to the vent holes in the battery.)

Tools needed:
  • 10mm wrench
  • 12mm wrench
  • 1/2 inch wrench
  • Vise, large adjustable wrench or vice grips
  • Two small flat edge screw drivers
  • Tape
Save yourself lots of the time and trouble with this kit.

You will not have to figure out what you need, go shopping around to get these parts and then modify them. You will not find the battery riser or the positive connector at an auto parts store.

You have to follow the normal precautions of disconnecting the negative battery connector first and connecting it last or your can short the positive connector to any exposed metal in the car. If you have no desire to work on electrical parts you may want to buy the kit and have your battery professionally installed.

You will save money and get a stronger battery. One dealer I called wanted $166.44 just for the original battery, which has a smaller storage capacity than the Mazda Miata Battery we sell separately.

Don't wait till you battery totally goes and you have to pay any price just to keep the car going. Buy this kit now and save and never have to go to a dealer just to replace the 12 volt battery in your car.

Two users have told me that their Prius now gets better mileage with the new battery. One 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 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.

Another user had let the 12 volt battery degrade to a point that he had to turn the ignition on and off four or more times to start the car. He told me his gas engine would never shut down when he was driving.

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

Customer Comments:

"I appreciate your quick shipping and weekend replies. Battery is in car, runs fine! You save me 130+ tax and four hours if I had fudged it myself."

V. O., Shoreline, Washington

"I successfully installed your Prius battery conversion kit today on my 2001 Toyota Prius. The parts in your kit were noticeably better quality, heavier gauge copper wires and connectors than the original Toyota connectors.

Your instructions were easy to follow, and it was very helpful to have the recommended torque (in Foot Lbs), to tighten the bolts for the ground connector to the floor of the trunk.

I pulled a used Miata battery out of my 93 Miata, and put it into the Prius. The Prius now works perfectly! I did not have any problems with the Prius. As soon as I turned on the ignition, it started right up. All the display panels were normal, with no error lights and no warnings.

Thank you for a great quality upgrade kit.

T. N., Madison, WI

"2002 Prius is alive again

Thank you for developing and selling the conversion kit so we could put a new 12 volt battery in our Prius. We bought a new 12 volt battery from Toyota (for more than $160) and then found out that we needed to buy a conversion kit to install it. We ordered the conversion kit from them over a month ago and it still has not come in. It was very sad to look at our dead Prius in the driveway, and to have to drive something that produces more pollution and uses more fuel. Thanks to you the Prius is back on the road. I guess we'll put the Toyota battery in our 2005 Prius when it develops a need for a new one.

You certainly prove that being an entrepreneur can be a good thing. Your other products look very interesting also. By the way, I placed our order on a Friday, got the conversion kit in the mail the next day and the battery arrived on Monday. The conversion kit parts are of very high quality and the instructions are very clear. It is hard to beat that. I wrote to the general manager of our Toyota dealer and offered to guide his customers your way if they end up in the same situation we were in.

Thanks for products that were badly needed,

L. T., Louisa, VA

From a California Customer:

"I am truly amazed that the ordered Prius battery arrived as quickly as it did (particularly considering there was no cost for shipping).

All in all (our run to Kragen for vice grips not inclusive), it took approximately 20 minutes to install the battery and the kit. Instructions were astoundingly clear--even for a non-mechanical type like myself--and the illustrations contained within were a bonus.

Compared to the $400 (and then some) for a replacement battery plus service Toyota wanted to charge us, buying through your site was of benefit in numerous ways.

Thank you, once again, for the battery and your follow-up.

G. S., Hayward, CA

From a customer in Washington state:

"I want to thank you for prompt shipping of my Prius battery and installation kit. It was very easy to install. (about 30 min) Everything in the kit was a perfect fit. I think your battery and kit is far superior to the original Toyota battery setup." S. R., Seattle, Wa.

From a California Customer:

"I ordered an upgrade 12 volt battery for a 2003 Toyota Prius with a kit containing a spacer and new connectors to fit the upgrade battery to the cars system. I ordered it late on a Friday and both the battery and other parts arrived the following Wednesday with all in one box. Better yet, the order included free shipping. The text installation instructions were clear and adequate to install the parts. A diagram or two would have helped but I had little trouble. Overall, I was very satisfied." R. H., San Jose, California

Note: We have added diagrams to the instructions.

From a customer in Florida:

"The Prius Battery completion kit was complete and prevented me from having to locate various components to complete the project. Directions were clear for installation. Battery arrived drop shipped UPS from source that was near to me (120 miles) quickly. Conversion went quickly (did not time it but was about a half hour). After four starts of the engine to get rid of the warning light (as informed in the instructions) everything worked perfectly." J. J., Williston FL

From a customer in Vermont:

"Very quick shipping, everything arrived in great shape. The instructions included were very clear and the product did exactly as was described. This saved me a lot of time and money using this product. Thanks!" B. H., Essex Junction VT

From a customer on a Toyota Dealers lot in Washington DC:

"I recently ordered and received a Prius battery and adapter kit that WORKED LIKE A CHARM. The clarity and extremely well thought out nature of the instructions alone may have been worth the price. My sister and I installed it in the parking lot of a dealer who could not get us a Toyota replacement for 3 weeks!

You might like to know that my sister is a special ed teacher with 2 kids. She was facing over $600 in car rental fees if not for you!

Toni Burnham

This kit ships for free via UPS ground or Priority Mail (whichever is faster) to the United States when you also include the battery in your order. Just select the shipping method "Free to 48 states for $50 order" The battery and kit are shipped together to most of the western united states. For locations that are not in the western unites states the battery is shipped separately within two business days (often one) from Connecticut, Florida, Illinois, Maryland, Minnesota, New Jersey or Texas. To be specific if you battery will get to you in one to three business days via UPS ground we ship for free from our warehouse. Click here for a map with guaranteed delivery times for UPS ground from our Sylmar (part of Los Angeles) location.

The story behind this kit:

I own a 2001 Prius. The Prius pictured on this web site is mine.

When the dealer told me they wanted $133 (prices have gone up since then) for a 12 Volt replacement battery. I said no way!

I searched the internet.

What I found were instructions on how to install the Miata battery but you had to buy all the parts, modify the positive connector, create a plastic tube assembly and create a retaining block.

So I did some more research and came up with my kit.

Instead of the retaining block we use a battery riser which brings the height of this battery up to the level of the Toyota one. This is industry standard practice.

We have sold hundreds now with no problems other than from people who leave the battery connected without running the car for weeks at a time. That is why we also now sell the disconnect switch so Prius owners can easily disconnect their battery when they are not going to be using their Prius for a week or more.

If you do have a problem with the battery the manufacture does honor the warranty.

To keep the price down I had to buy the positive connectors in volume because it is custom made in the United States.

We also save you time by shipping the kit and the battery right to your front door.

I hope you will be one of my customers!

Bernard Littman, Owner E Learn Aid

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

Installtion Kit for installing Miata battery in a Prius 2001, 2002 & 2003 prius12vkit  US$30.00  

Optima battery and installation kit for Prius 2001 to 2003
Optima battery and installation kit for Prius 2001 to 2003


We are closed. Your order will not ship till 21 December 2020. 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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