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AJ Woodward has a method for recharging Epson P-2000 Multimedia Storage devices that will work with Sony PSPs, Toshiba Pocket PCs, or anything else that uses a 5V of input. Some very simple and minor assembly required, with total cost of about $17 and a visit to Radio Shack (well, not counting AA batteries). No soldering required.

Spare batteries for the Epson P-2000 cost $60 - $80, if you can find them. An alternative solution is to charge the Epson P-2000 using inexpensive AA rechargable batteries and a few off-the-shelf parts from Radio Shack. No soldering or electrical tape required! This external battery solution has enough power to charge the P-2000 three or more times.

For those willing to use a soldering iron, he also provides an even cheaper method, ringing in at about $6.20 (not counting AA battery costs). Also, get a Battery Xtender or use rechargable AA batteries.