From Ford’s website:
Powered exclusively by a lithium-ion battery, the 2014 Ford Focus Electric has an EPA-estimated rating of 110 city MPGe.
Brake Coach To help you optimize the use of the regenerative brakes, use your Brake Coach in the left 4.2-inch screen to maximize the range of your Focus Electric.
The Heart of It All A 23kWh, high-voltage, lithium-ion battery system. Advanced liquid heating/cooling regulates battery temperature. Helps maximize battery life and miles from each charge.