This is a brand new replacement battery for Apple's Nano battery. The nano is the most difficult battery to replace. You can solder or twist and tape the wires for replacement.
2nd generation iPod nanos were aluminum all around, came in several colors (silver, blue, green, pink, red, black), and came in 2GB (silver only), 4GB (silver, blue, green, pink, red), and 8GB (black and red only) capacities.