The fill in the blank part usually involved making life easier, more efficient, healthier and less costly. Things like, build a car that gets 60 miles to the gallon, an air conditioner or heater that is truly efficient, and good for the environment, an air filter for the home that really makes the air clean and healthy to breathe.
Battery life can be extended by storing the batteries at a low temperature, as in a refrigerator or freezer, because the chemical reactions in the batteries are slower.
Battery size generally refers to the shape, voltage, and terminal layout of a battery. Thus the term "size" has become interchangeable with "type". Batteries of different types will usually not have the same dimensions and terminal layout.