Just use rechargeables. A damn sight easier than hand-winding a torch all the time. You can get USB lights if you don't want to take batteries out.
If you want to avoid batteries altogether, get a dynamo hub.
The old Sturmey Archer Dynohub really has no noticeable drag, so I would imagine more modern designs are similarly free-running. It's not like a bottle dynamo.
Just use rechargeables. A damn sight easier than hand-winding a torch all the time. You can get USB lights if you don't want to take batteries out.
If you want to avoid batteries altogether, get a dynamo hub.
The old Sturmey Archer Dynohub really has no noticeable drag, so I would imagine more modern designs are similarly free-running. It's not like a bottle dynamo.