The Volvo S60 Mild Hybrid for sale is a new class of hybrid car for sale. This new hybrid design combines an internal combustion engine with a 48-volt battery, a 12-volt/48-volt converter, and an electric motor to power your vehicle and systems, as well as propel you down the road. The electric motor is both a starter for the engine and a generator to store energy in the 48-volt battery that comes from regenerative braking. A Mild Hybrid is equipped with a smaller battery than a plug-in hybrid and does not offer a pure-electric range.