While searching for an extra mini USB cable to charge my HTC Tattoo, I wasn't sure whether to get a 5-pin or 11-pin. I emailed the HTC support team, who gave me this response:
"That cable will work fine, as will any mini usb cable, it is the 5 pin mini USB which is fine for Sync, data transfer and charging. The 11 pin ExtUSB connector is only required for serial connections, service cables, and headsets."
'That cable' refers to this product (I sent them the link to Amazon). I have used it for charging & data transfer and can confirm that it works perfectly. It seems to be identical to the original cable that came in the box. Recommended!