I need Help for a lego based generator

​ Base idea: It’s going to be a LEGO vacuum engine that turns an electric motor to recharge a battery. What I need help with: How can I connect the LEGO electric motor to the battery so it can recharge it? And how can I connect the battery to a USB port? Goal: I want the battery to charge while the vacuum engine is running (I know it probably won’t be very useful) so I can use it to charge my phone later. Thanks for the help! submitted by /u/Jac_lve [link] [comments]