> 15 minutes of cranking would give 4 hours of play time. Ok that doesn't sound fun at all. But here are the bigger problems: > https://housegrail.com/best-h

> 15 minutes of cranking would give 4 hours of play time. Ok that doesn't sound fun at all. But here are the bigger problems: > https://housegrail.com/best-hand-crank-generators/ https://housegrail.com/best-hand-crank-generators/ Those things are fucking huge -- you are comparing some junk ass Ali Express device to proposing actually integrating in the product. Could you find a cheaply and readily available mass produced motor/dynamo that would fit in this 9mm thick form factor and still produce enough power? And at the end of the day the only reason that a device like this is possible for them is they can basically build around easily sourceable, highly integrated parts - The only thing really custom on this is the shell/mechanicals - and that probably blew the majority of their design budget. Spending 10s of thousands for a custom micro dynamo for a dumb feature doesn't seem like well placed priorities. Also, you would have to integrate this without interfering or degrading the primary function of the crank.