The L5 PCM is a supplemental lithium ion battery installed in the spare tire well of your Toyota Prius as shown in Figure 2. The L5 PCM provides approximately 5 kilowatt hours (kWh) of onboard electrical storage capacity. This additional electrical energy enables the Prius to use pure electric drive more often and for longer distances, resulting in fuel efficiency gains and CO2 emissions reduction over the standard Prius. The L5 PCM must be recharged from an electrical outlet or extension cord equipped with GFCI. The L5 PCM does not receive any regenerative charge during driving. When the L5 PCM is charged, the Prius is capable of achieving fuel economy in excess of 100 miles per gallon (mpg) and reducing CO2 emissions by up to 2/3rds over the standard Prius.
The L5 PCM can provide electrical assistance for approximately 30 to 40 miles of driving on a single charge before becoming depleted. Once the L5 PCM’s charge has been depleted, the vehicle’s operation and fuel economy reverts to that of a regular Prius until the L5 PCM is recharged by plugging in.
Key Features
Operating the Prius with the L5 PCM engaged
• Electrically assisted driving range of 30 to 40 miles on a single charge
• Up to 100 mpg or greater city/highway combined fuel economy within the 30 to 40 mile electrically assisted driving range
• Prius resumes standard operation and fuel economy when the L5 PCM is fully depleted or turned off
• Maintains the Prius’ Super Ultra Low Emissions Vehicle (SULEV) emissions rating
• Up to 2/3rds reduction in CO2 emissions
• Prius’ Energy Monitor Display indicates the L5 PCM State of Charge (SOC)

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