Buy a portable charger. All you need is to make sure the MP3 player you're using is compatible with it. You can get them from Best Buy, Fry's, etc.
I'm heading out on a six month hike. I'm trying to figure out the best MP3 player option. Here are my considerations:
I need at least 60Gb of space for audio books and music, including lots of WMA files, so IPOD isn't an option.
I will only be able to recharge batteries once every five to fifteen days, so the Toshiba Gigabeat's 12 hour battery life is a problem.
The Cowon D2 is great, if I am willing to spend about $800 on SD cards, which I might do as long as it's true this player can be updated to work with 8gb SDHC cards and I can't find any other good choices. The touch screen is a drawback for hiking, but the battery life is great.
Considering the total cost of the D2 plus 60GB of SD cards would be nearly $1k, maybe it would actually be cheaper to buy 60GB worth of individual flash players that actually run on AAA batteries!
An ideal option would be a very light weight player with simple controls that plays MP3, WMA, etc and runs on AA or AAA batteries with good battery life.
I will be "bouncing" a box of supplies from town to town for resupply, so I'd considered having a 60gb or 80gb HDD player in the bounce box and then bringing a small, cheap flash player on the trail with me between towns, but is it possible to transfer data between any of the HDD mp3 players and a flash player?
Anybody else out there smarter or better informed than me have any suggestions?