I had an old Motorola Droid I used to do this with, then switched to my Windows phone without any issues. Battery lasts a few days when you turn everything off,

I had an old Motorola Droid I used to do this with, then switched to my Windows phone without any issues. Battery lasts a few days when you turn everything off, and the music app's interface is clean and easy to use. I just dropped a 128GB card in with all my music and podcasts and I was off and runnig. You can find several older Android and Windows phone models for around $50 or less on ebay and most of those early phones had replaceable batteries as well. Grab and extra battery and you should be set for a few years.