Burn less gas. Upgrade your Prius to a plug-in.

Plug-In Supply Battery Bank

Battery Module Shown

Plug-In Supply Installed Battery Bank

2 KW Battery In Car

All over the world people are upgrading Prius cars to plug-in hybrids using the Plug-In Supply Modular Plug In Battery™ System. You can upgrade other hybrid cars too.

Complete list of vehicles »

Can your hybrid do this? You can double or triple your gas mileage and even drive without burning any gas!

Prius Gen 3 Display

Dashboard display of a Gen 3 Toyota Prius with a Plug-In Supply 4 KW plug-in system.

Prius Gen 2 Displays

Dashboard displays of Gen 2 Toyota Priuses with Plug-In Supply 10 KW plug-in systems.

Safe. High quality. High performance. Easy to assemble. Easy to install. Easy to use. Easy to move to another car. The Plug-In Supply Modular Plug-In System does it all.

What customers are saying

"May 29th, 2014
I have a Prius 3 (P3) (Registered March 2010) with the plug-in Suply (PS) system rebuilt with 10 kW. I have reported here: www.priusfreunde.de -> Forum -> Plug-in Conversion of Plug-In Supply with 10 kWh.
Now to your questions:

Which system do you have installed?
10 kW with 76 pcs cells of Winston bought in Germany:
The Battery Management System (BMS), I have installed the PlugIn Suply.

Why did you choose for the kit of plug-Suply?
The other systems such as Engineer working with low battery voltage and need therefore to generate a DC-DC converter to the voltage of approximately 250 volts. The big disadvantage is that the currents then limited to max. 20-30 amps are. If I use my P3 electrically approximately 100 km / h drive, the electric motor draws about 65-75 amps, so that the original battery becomes exhausted quickly and the gasoline engine must start. The PS, since it operates without a converter, replacement delivery well over 100 amps, so that the original battery is always "full" remains.

What has been your experience ?
I can highly recommend the PS system after almost a year and about 15,000 km. So far it works very reliably . I am very satisfied.

Do you use it for long distances ?
Yes , I am often more than 100 km and several times more than 500 km. After about 100 - 120 km , the additional battery is empty and the BMS prevents deep discharge which would damage the battery.

What is the average consumption before and after the changeover ?
Previously at 4.8 l/100km . Currently about 1.6 l/100km and 1.9 l/100km in the wintertime if I stay among the 100 km to the next charging. Since the upgrade I have an average fuel consumption over the 15,000 km of 2.9 l/100km . This depends on the driven long-distance more than 100 km. "

— Johann B., Germany

"June 10th, 2014
Back in the last quarter of 2013 I bought a 7KW system for my 2006 Prius. It has been working wonderfully since then and I would be more than willing to talk to prospective customers for you."

— Phil G., Manheim PA

"April 7th, 2014
Some people play video games. I play MPG games. Just got 60.8 miles on a charge with 0.2 left in the "tank". Air temp. 40F. Total elevation change: 500 ft drop, start to finish. No wind. This is what happens sometimes, when I can't sleep."

— Keith, April 7, 2014

"March 18, 2014
I am a happy customer. Yesterday I took full discharge and I was able to drive 43 km, out of town, speed up to 80 km/h , only in ev. It was great. Thank you"

— Mircea L. Bucharest, Romania 7KW in Gen 3 Prius

Read more reviews »

Prius Plug-in with 6 KW Plug-In Supply system.

Solar powered Prius using a Plug-In Supply system.


  • Systems are made using high quality, high performance, long-lasting components.
  • All systems allow access to the spare tire.
  • Public charging station (fast charge) compatibility is available (J1772, etc.).
  • Our Modular Battery SystemTM is easily moved from car to car, without a hoist, eliminating the worry of payback on your investment.
  • All systems are available as Do It Yourself (DIY) or Ready To Install (RTI).

With a Plug-In Supply lithium iron phosphate add-on battery pack you get true plug-in performance at a fraction of the price of a new plug-in car and with much greater range — up to 7 times the electric range.

Contact us for more information

Plug-In Supply Inc

(415) 755-3864


  • New modular battery design gains immediate acceptance
    Our new modular battery pack design is what everyone wants. The new modular battery design provides access to the spare tire, the pack can be installed by hand without a hoist, and you can move packs easily from car to car. The modular design makes it easy and safe to work on a high voltage battery. Each module has its own plastic box, fuse, and quick connectors to quickly isolate it from the rest of the pack and the car. You can add more batteries any time.
  • Modular Battery Packs with cylindrical or prismatic cells
    We now offer Modular Battery Packs built using cylindrical or prismatic cells. This allows us to offer many sizes of packs for all kinds of applications. For example, you can buy or build the following packs for the Prius: 2 KW, 4 KW, 5 KW, 7 KW, 10 KW, and 15 KW. These are available as DIY and RTI.
  • Save big with our DIY system
    Build your own battery pack and save! See all DIY info »
  • Plug-In Supply BMS
    We designed the best lithium battery management system (BMS), which thrives in the harsh conditions inside a large battery pack. It's only available in Plug-In Supply products.
  • Installation instructions available
    You can now view the pack assembly and system installation instructions to help you decide if you are capable of building your own battery pack — our Do It Yourself (DIY) option — and installing our system in your car. View the instructions »
  • Order direct from Plug-In Supply
    We sell direct to consumers. Contact us to order »