Although this is not directly bike related I mostly listen to my Sansa Clip 4gb while riding. It gets me through my commute and solo rides. Recently it stopped turning on, except when it was connected to a power source. After reading some forum posts it seemed likely that the problem was either a bad connection to the battery or a bad battery. I pried it apart with a knife and found that one of the tiny wires connecting the battery to the motherboard was broken. I stripped it back with a pair of scissors and very carefully used a soldering iron to reconnect the wire and the board. It took about 30 minutes and now it's working again.