This size of battery is found in a Hybrid Electric Vehicle (HEV).

The subcompact EV comes with a battery that has 12-18kWh, the mid-sized family sedan has a 22-32kWh pack, and the luxury models by Tesla stand alone with an oversized battery boasting 60-100kWh to provide extended driving range and achieve high performance.

In hybrid electric vehicles normally 40 kWh battery is used which is nearly of 150 kg

Explanation:

A family car which is middle in size neither very large nor very small need a battery if capacity of 32 kWh to 40 kWh

And the size of the battery is dependent in the capacity of the battery, the battery which has large capacity has larger size and the battery with less capacity are also smaller in size

And the battery which has a capacity of 40 kWh is normally of 1.5 tons, that is 150 kg