The ELR will use some form of the Voltec propulsion system, which combines a 149-hp electric motor, 1.4-liter four-cylinder range-extending engine and a 16.5 kWh T-shaped lithium-ion battery pack in the 2013 Volt. Cadillac has said that the ELR will include an electric drive unit, a four-cylinder engine-generator and a T-shaped lithium-ion battery, but has not specified the specs of that equipment, leaving the door open for a high-performance version of the set-up.
Media reports have indicated that the ELR will use a larger, more powerful powertrain to provide more performance and help offset the added weight of the requisite luxury makeover. In June, Car & Driver suggested that the 1.4-liter four-cylinder used in the Volt will be dropped in favor of a ~1.8-liter version of the Ecotec MGE developed by GM's Opel brand. That report also said that the ELR may use a larger 17 kWh battery, with high-cost, lightweight materials helping to offset the added weight of the larger powertrain components.
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