Powere up after charging

Whenever I try to make an additional charging on a car lead battery, I imagine and hope some improvement in the motor power performance. And I have no experience to be betrayed by the result after full charging. Actually feel I comfortable improvement as if the motor has some tune up treatment.
There must be several reasons for the good result:
Fully charged lead battery does not require charging ceremony utilizing motor power, so there exist no power loss for charging?
The sparkling power has increased leading to stronger combustion?