>>989472>not having a hub dynamo with usb output>not even having a piggyback battery pack>not realizing a small emergency phone is both smaller and cheaper than a good dedicated audio player>not realizing that if you're mapping you might as well play music from it too at the extra battery drain is minimalSoooo, ta save battery on your smartphone you'd have to carry a Garmin as big an expensive as your phone, a media player as big and expensive as an emergency non-smartphone - and you think you're being clever?
Are you a bit daft m80?