Alternatively design a new charging system like in a kinetic watch so you have a permanent integrated battery in a light that can be removed / placed anywhere and doesn't rely on a moderately priced wheel that weighs a tonne/expensive wheel that's moderately heavy.
Alternatively design a new charging system like in a kinetic watch so you have a permanent integrated battery in a light that can be removed / placed anywhere and doesn't rely on a moderately priced wheel that weighs a tonne/expensive wheel that's moderately heavy.