1 volt of battery won’t light 3 volt LEDs—unless there’s a joule thief in between. Joule thieves are fun to build, you can read by one and they are a great introduction to playing with alternative micro-energy ideas.
Very effective hi-fi sound improvement from outside of the box—Leeds in England—and you can try some for free.
The most useful hints in the shortest post, because your time is valuable. And a short welcome to my new site. Thanks.