"Power bank" for bike

grabcad

My project! I wanted to make a stationary flashlight on the bike, charging for action camera and charging accumulators from bicycle dynamo hub. The flashlight is taken from the headlamp, powered via a special battery charge (usb on the left side). The batteries are charged from two tp4056, connected in parallel to increase the charging amperage. Also, the batteries can be charged from the bicycle dynamo hub - power from the dynamo hub goes first to the diode bridge, then to the mini 360 charge board, where the voltage drops to 5.2V, from it the current goes to the tp4056 boards, capacitors and ionistor are used to smooth the voltage ripple . To charge the phone or camera action from the battery, the voltage through the boost converter MT3608 rises from 3.7 to 5.2V. The batteries were taken in the service center after repairs ipad, the total capacity of the assembly 20 AH.