Charging Issues

My clip will not charge,when I plug it up to pc,I get the device not recognized error.I have tried 3 different cords and have reset the unit by holding the switch for 10 seconds.The battery is low so the device will only turn on saying low battery and turn off by itself.How can I fix this ???

Many cell phone chargers can be used to charge up these wee beasties as long as it has a mini-USB plug.