As far as I know there's a battery in such a windup torch as well. And sooner or later it's going to break anyway, like normal rechargeables. And so you have the usual toxic dump from that battery, and you can throw the torch away as well if you don't know how to put another battery in it. I have also such a windup torch, and it worked quite good in the beginning but after a while it started giving less n less light for the same amount of spinning. Nevermind that it's a huge thing to take with you and that my hand got a bit ached by turning the little crank, because I tried to charge a phone with it to a decent energy level... I'd say you get better quality by just using a standard good quality torch/headlamp and use rechargeable batteries in that, and a solar charger. It will give you a much more useful light, and it's going to last you probably longer as well because of the better quality you get.
That's just my thought..