battery wire colour issue

Hi everyone.

I’ve just bought a replacement ifixit battery for my iPod nano 1st gen. However the battery in the iPod has three coloured wires (black, red, white) but the new battery has wire colours (blue, black, red).
I would just like to know which wires correspond to which. I’d rather not take a guess as I don’t fancy wrecking my iPod.

There was no support documentation with the battery to help me either.

Thank you for any help.