Conserving every bit of power is the primary challenge when you are living off a small solar panel for multiple weeks at a time. High-resolution files require much more processing power to decode, which drains your device much faster than a standard compressed format would. You should look for a tool that lets you select a balanced bitrate to keep the files small while maintaining enough detail for a pleasant listening experience. I usually spend a few hours at home converting my favorite albums into a universal format that even the most basic media player can handle without any technical lag. It makes a massive difference when you can carry thousands of songs in your pocket without worrying about storage limits