New Prius Battery Kit (GEN2, 2004-2009)

I've had my batteries up and running for a few months now and have about 600 miles on them. My 2004 Prius is running just like it did when it was new. The battery State of Charge (SOC) is no longer fluctuating like it was before, and the car seems to rely less on the Internal Combustion Engine (ICE) than it had been recently. Very pleased with the results and glad that I don't have to worry about when the next module is going to give out. I have more confidence in taking a long trip and not worrying about how long the battery pack might hold out.

After doing a bunch of research, I decided to buy one of these as opposed to a reconditioned battery which was about in the same price range (although installed). I'm glad I did, as 5 months down the road this is working great. Our Prius is a 2006 with 220000 miles and runs as good as ever. As far as installation, it was a little tough, as the the polarity of the numbered cells in my kit came oriented differently than what the directions showed. Not being an expert on this I disassembled the cells to match to orientation in the directions. This, I found out later from the seller, was unnecessary as all that matters is that the polarity of the cells matches what's necessary for the installation. Also, the connection from V15 to the control module is a little short. I missed a sensor connection there, which led to a uninstall/troubleshoot/reinstall situation. So my installation advice to those like me who have some electrical/mechanical aptitude but are not experts is buy a good pair of insulated gloves (there is, IIRC, 220v at one of the connections), a good multimeter, and go slowly and methodically through the installation. Then you will have a new battery that should last years as opposed to a reconditioned one that may only last weeks. As for price, this battery was $900 cheaper than the best quote I got for a new battery installed at a reputable shop. And that was probably a bargain quote as Toyota apparently charges $3-4 G's. So with a little knowledge and patience, good tools, and a good work space the potential for savings is great.

This is my second one of these. The first one is still working perfectly after three years. I've tried rebuilt batteries but you never know how long they will last. I have alot more confidence in new unused batteries. It's worth the wait for these battery kits.

I just purchased and installed and it worked right off the bat. the only reason I don't give this 5 stars is that I need to use the battery for a lot longer to see its longevity. if it does well for a while and I remember, I will change to 5 stars.

I don't get to say this often, but my experience with buying this battery completely exceeded all of my expectations. When the battery pack on my wife's Gen2 Prius failed in July this pack was out of stock and not likely to be delivered before we needed to get the car inspected (in July), so we decided to go with the battery whack-a-mole process and replace failed modules and rebalance the pack. Two months later it failed again, so we broke down and ordered this kit, which had an estimated ship date of early November. We were shocked when it shipped in early October (nearly a month early). It arrived extremely well packed, the instructions were clear, and I had the whole installation done in less than four hours. The car is now running like new, with much improved mileage and drivability. I'll definitely be back to purchase a kit for my Gen3 when it needs a battery replacement.

If you are considering replacing your dead or dying pack, do not buy a refurbished one. Buy new. These guys at New Prius Batteries know what they are doing and my new pack is running awesome. My car is running better than it has in years. The new pack is everything they say it is. The install was fairly easy. Although you will need to follow instructions and take it one step at a time. And during the install, Nick answered my questions so quickly so I was able to get it installed. Basically for $1600 I didn't have to replace my 2007 Prius. Nick and his team are the best.

Never having done this job before, it took me about 5 hours to install the batteries in the frame carrier, and another 3 hours to to the R & R in the vehicle. The documentation seemed to imply that the batteries would mount into the pack as they were packaged in the box, with the #1 pack closest to the MCU; however, it soon became apparent this was impossible without turning the units upside down, and reversing the ends. This left the numbering and on the individual modules on the bottom of the module, and no longer visible unless the module is removed. Then the secondary wiring harness had number from what the documentation said were a GEN 3 unit, and mine was a GEN2. Then the email that should have clarified this discrepancy further confounded it by saying the GEN3 numbering system was being changed back to the GEN2 system? Whatever, it was fairly obvious where the wires needed to go, so I put them there. Finally, the connection to the pack that goes to the high voltage disconnect is pretty ugly, and impossible to get installed that doesn't put a preloaded physical stress on the wiring. This should have replacement cables supplied as a part of the kit. It would be reasonable to think this kit will not have the durability of a factory battery, which should be expected at half the cost. So I plan on babying it by avoiding all high discharge current activities ( heavy acceleration up hill, air conditioning on when stopped, etc.) But it seems to work so far, and it is not difficult to install. A good sanity check is to measure the series voltages of the pack as you install each module..

I've been driving the car for several weeks, a thousand miles maybe, and it runs beautifully. 55 miles per gallon city and highway. Better than when my son bought 55,000 miles ago. Follow the directions and watch several Youtube videos and if the car is in decent condition otherwise you will be very pleased with this product.

I am very impressed with the overall product. At 474,000 miles our 2004 Prius finally indicated the Triangle of Death... while on the interstate at 75 mph. The Prius still functioned well enough to continue and park at home some 150 miles further along. We had been considering a new battery for the past year as there where other indications. Our new battery kit was easy to order, and arrived weeks before the estimated time given. The price is very competitive or well under most other options. The instructions are detailed and while there are some inconsistencies in what is included and what is left out there was nothing critical to properly installing the new batteries. Small issues were easy to resolve by reading ahead or reviewing previous sections. The design of the battery modules really limits potential mistakes as well. The kit and instructions are not perfect but close enough to merit 5 stars. An experienced mechanic can easily do the entire project in well under a day; first time through the procedure. What remains to know is can we get another 500,000 miles out of this battery? Given the company pitch it should outperform the OEM Panasonic/Toyota battery as installed; ask me in 15 years. My only concern in the overall design is in the major changes to the cooling airflow pattern inside the Toyota battery case. Without added vanes to direct air flow will the batteries on the far side from the cooling ducts see adequate cooling? If you guys have done testing with 2 (an upper and a lower) temp sensors on each module under real world use to confirm even cooling of the assembly I would be much happier to recommend this design to others. Those tests should be posted on your website; and would have locked in my purchase much earlier. The OEM design baffles the airflow between each module; though the larger spacing of the New-Prius Battery design might allow significantly more overall air flow. Right now it is a big unknown but I like the design enough to risk those issues. My career experience as an early VW mechanic (air cooled engines) supports great care in design in this area. Flow is often not going where you think it should in air-cooled designs with out proper ducting and careful placement of vanes. But there are design I've seen that work well enough for the need with very little effort made to direct flow; so all might be fine in this case. Ask me in 15 years. Overall a great product and so far I am very happy with the purchase. Jon G