guylhem thanks for the link, ordered some to my collection

and there is a fuse in the USB, i know i blew mine when i was experimenting with an DIY battery powered charger and it was late at night and i did not check the polarity of the USB plug, i did not find a replacement fuse so i opted to use 2 strands of wire and soldered it in where i took the fuse out, and my USB have been working fine since then, but if i should experiment again i will check my connections 5 times....