Where can i get a 18v FBP18 McKeller battery, Nu Tools don't have one?

It's unlikely that they are made. If you paid less than £80 for the drill then its not likely you'll find any replacement parts at all. Better known manufacturers sell nearly all spare parts for their drills but its often not economical even if they are available. For example a Bosch battery can cost £50 easily, other parts such as motors can cost nearly as much as a complete new drill
Unfortunately for you and the environment society dictates you throw it away and buy new :(

G
January 2010