What do i put in between a electric magnetic motor and the battery to charge it without the battery trying to?

Question

im trying to charge a battery with a magnetic motor but i dont know whats in between them that stops the battery from trying to run the motor so that the motor will charge them?

Answer 1

a diode maybe? that will only allow the current to flow in one direction.

Answer 2

in a car the alternator [its like elect motor]] sends 14.5 volts to battery..a voltage regulator of some sort would keep voltage going out at 12 v

Answer 3

If the shaft of a DC motor is spun it can act as a generator.

If the voltage is higher than the battery voltage and it is connected properly the battery will get charged. If the voltage is lower then  Gengi M's suggestion will work. However, the voltage generated has to account for the additional forward drop of the diode.