1. When the generator output has current, it means there is power generation, that is, with load, it will naturally become heavier when shaken without load, just to overcome friction. is very light, it means the output current is very low.
2. 5V cannot directly charge the battery. The highest battery charging voltage is 4.2. 5V supplies power to the mobile phone, then the battery is charged by the charging circuit inside the mobile phone. The “line charger” equipped with the cell phone is actually a power supply.
3. If the battery cannot be charged, the voltage may be too high or the current may be too high. The battery protection plate can also protect the battery. Anyway, based on your description, it's actually After charging, the handle is very heavy. The internal resistance of the battery isble, which is equivalent to directly short-circuiting the generator.
4. Reduce the gear acceleration ratio. The reduction ratio of the hand crank generator should be appropriate if it is too small, it will be light to shake, but only high speed shaking can maintain a ratio. certain power output if it is too high it will be difficult to shake it. In fact, it is very tiring to use hand-cranked electricity, and it takes at least an hour to fully charge a battery. It is only used in emergencies. It's a real pain to use it as a main charger.