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Hymotion L5 Plug-in Conversion Module Battery Pack


Pros: It's soooo easy to plug-in at night and wake up in the morning with a full "tank" of electrons each and every day.

Cons: Occasionally, it causes a "code" to be issued by the ECU

I've been wanting to drive electrically since I was 16 and designed an all-electric car with my Engineer-Dad. It was to have 2 used street-car motors on each rear wheel and about a million PbA batteries.


Today, I'm driving a silver "recycled" Prius with a 5kWh Hymotion battery pack in the trunk and an EV button. I do most of my driving in electric mode and a 12-gallon tank of gas lasts me 3 months or 1200 Miles. Today, for example, I drove downtown, 36 miles, and used 0.9L or 0.25gal, yielding 142 MPG (US)/170 MPG(Imp)/1.6 L/100Km plus, of course, a "tank" of electrons worth about $0.44. Hey, that's some 3 cents per mile. I only have 177 miles on this current tank of gas, but have been averaging 240 MPG (US) so far.


I love getting into my Prius in the morning and seeing a full tank of electrons as I back out of my driveway. I can usually stay in EV mode most of the day before coming home and plugging in again over night. I don't have to stand around and wait for the tank to fill up or worry about it over flowing. It's clean and quiet and soooo affordable.


The drive is clean and quiet and powerful. I have considerably more electric power now than without the extra batteries.


The only negative is the inital purchase price. It's absurd at over $10,000 (US). My installation was used and, therefore, much more affordable. If I had to pay retail, I'd go with an Enginer Kit for about a third of the Hymotion price.


Who would be so stupid as to think that this is not the easiest way to drive?


Wish I could afford to upgrade my Prius with this...what a great opportunity to increase mileage and reduce emissions...this just seems too costly at this point. Hopefully it'll get cheaper!

Hymotion L5 Plug-in Conversion Module Battery Pack

Hymotion L5 Plug-in Conversion Modules are designed to convert Toyota Prius HEVs into PHEVs that can achieve up to 100 mpg for 30-40 miles. Works for Prius models from 2004-2008. Charge time of 4.5 hours $9,995 comes with 3-year warranty.

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FAQs from the Hymotion Website:


When are the Hymotion™ L5 Plug-in Conversion Modules (L5 PCMs) going to be available?

The L5s are currently available for purchase with exact delivery subject to customer demand and product availability. If you are interested in converting a fleet of three or more vehicles, please email us at


How much does a Hymotion L5 cost, including installation?

The L5 will cost $9995, which includes a standard 3 year warranty and installation at one of our Green CHIP (Certified Hymotion Installer Partner) locations.. In addition, all applicable taxes and a $400 destination fee must be paid upon installation.

Is the L5 plug-in conversion module available for other vehicles besides the Toyota Prius?

Our first product, the L5 PCM, is only available for the Toyota Prius, model years 2004 – 2008.


Can I purchase an L5 PCM conversion outside of the United States and Canada?

Currently we are only conducting L5 installations in the United States through our Certified Hymotion Installation Partners (Green CHIP dealers). Canadian vehicles can be brought to US installation locations.


Can I get a refund on my deposit?

Deposits are refundable for a $75 processing fee up until a month prior to your scheduled installation date.


Is there a warranty for the Hymotion L5 and the batteries inside?

The L5s have a standard 3 year warranty. Additional warranty options may be offered at a later date.


Will the Hymotion conversion alter the warranty given by the vehicle's manufacturer?

Federal consumer protection laws do not allow a vehicle's OEM to void a consumer's warranty for installing a Hymotion module unless the Hymotion module is the direct cause of an otherwise warranted problem. For example, Toyota shouldn't void your warranty on your headlights for putting a module in your trunk. The Hymotion L5 is engineered not to adversely affect any OEM-warranted system. Our product field testing of over 200,000 miles of real life driving did not show any otherwise warrantable problems on the stock vehicle caused by the L5. If a vehicle's OEM denies a Hymotion customer warranty service due to a problem caused by a Hymotion module, A123 will pay for the otherwise warranted repair. SEMA, the Specialty Equipment Market Association provides guidance on understanding the legal protection for aftermarket products, specifically the Magnuson-Moss Warranty Act. Click here for more information.


Where can I get service if I have a problem with my module?

If you experience any problems with your module, contact the Green CHIP dealer that did your install for diagnosis and repair of the problem. If the unit is faulty due to manufacturing, A123Systems will replace it.




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Green Options › Eco Friendly Green Products › Green Transportation › Conversion Kits & Components › Hymotion L5 Plug-in Conversion Module Battery Pack