When used for the first time or left unused for a long time, the motor may lose its magnetism and will not generate electricity when reaching the rated speed F+ and F-. When magnetizing, the negative pole of the motor. The 12V battery can be connected to F- and the positive pole to F+, about 5-10 seconds. If a small generator does not have a battery, it can also be magnetized by connecting four 1# batteries in series. Note that the generator must be at rest during magnetization, otherwise the voltage regulator could be damaged.
If the positive and negative poles and the excitation voltage can be determined, the magnetizing effect will be good during rotation, but attention should be paid to safety.
As long as there is no loss of excitation, there is no need to charge it. Nowadays, all generators are self-excited. It is generally not recharged after a loss of power.itation.
If you are unsure, contact customer service.