Shrey Fadia I was trying to build a similar kind of circuit … The motor gives out voltage ripple in the waveform if that’s managed then the circuit will be running up in no time. I tried with the 12v motor used with the bots.
Shrey Fadia check out DIY Rechargeable Batteries
Use a lipo/li-on battery with a battery management system (BMS) to charge and protect it.
If your dynamos can give ~13V, you can charge the cells through the BMS.