Battery system and electrically drivable motor vehicle

A vehicle comprising:

• an electric machine;
• a traction battery configured to power the electric machine and having a traction battery voltage and a traction battery capacity;
• battery electronics configured to connect to the traction battery and the electric machine;
• and
• a housing configured to receive the traction battery and to receive a supplementary traction battery having a supplementary battery capacity less than the traction battery capacity.

A vehicle comprising:

• a traction battery having a first charge capacity;
• a supplementary traction battery having a second charge capacity less than the first charge capacity;
• a traction motor;
• battery electronics connecting the traction motor to the traction battery and the supplemental traction battery;
• and
• a traction battery housing having a main compartment configured to receive the traction battery and at least one supplemental compartment configured to receive the supplementary traction battery wherein the supplementary traction battery is separately removable from the vehicle relative to the traction battery.