In this experiment I created a mechanical manual movement system for charging 12 volt batteries. The purpose of this video is to demonstrate to those who have interest, to realize a valid and safe method to obtain energy always free, easy and interesting.. The duration of battery charging time is subject to the time of execution of the manual movement. Required: motor/dynamo of at least 6 to 24 volts. Minimum condenser 75000 mF to 100000 mF maximum. Inductance of a washing machine pump. Non-return diode 15-20 amps. Weights to counterbalance the manual effort, minimum 12 Kg. Pulley for the dynamo. A washing machine flywheel. Iron or wood axis to couple weights and flywheel. Wooden handle to fix it to the flywheel. Note: In this video the rotation time is 5 minutes, but to have a good power for its use, it must rotate for at least 8 -10 minutes and with 7- 9 amps of absorption.